Kim Lefmann

Search results

• 2017

  Zero-order filter for diffractive focusing of de Broglie matter waves

  Eder, S. D., Ravn, A. K., Samelin, B., Bracco, G., Palau, A. S., Reisinger, T., Knudsen, E. S., Lefmann, K. & Holst, B., 2017, In: Physical Review A. 95, 2, 5 p., 023618.

  Research output: Contribution to journal › Journal article › Research › peer-review
  12 Citations (Scopus)
• 2016

  Constraining neutron guide optimizations with phase-space considerations

  Bertelsen, M. & Lefmann, K., 11 Sep 2016, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 830, p. 313-324

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  11 Citations (Scopus)

• HEIMDAL: A thermal neutron powder diffractometer with high and flexible resolution combined with SANS and neutron imaging - Designed for materials science studies at the European Spallation Source

  Holm, S. L., Lefmann, K., Henry, P. F., Bertelsen, M., Schefer, J. & Christensen, M., 21 Aug 2016, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 828, p. 229-241

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  9 Citations (Scopus)

• Neutron guide shielding for the BIFROST spectrometer at ESS

  Mantulnikovs, K., Bertelsen, M., Cooper-jensen, C. P., Lefmann, K. & Klinkby, E. B., 1 Sep 2016, In: Journal of Physics - Conference Series. 746, 1, 012027.

  Research output: Contribution to journal › Conference article › Research › peer-review

  Open Access

  File
  1 Citation (Scopus)

  290 Downloads (Pure)

• Optimizing a neutron-beam focusing device for the direct geometry time-of-flight spectrometer TOFTOF at the FRM II reactor source

  Rasmussen, N. G., Simeoni, G. G. & Lefmann, K., 2016, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 816, p. 106-112 7 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  2 Citations (Scopus)

• Simulating X-ray telescopes with McXtrace: A case study of ATHENA's optics

  Ferreira, D. D. M., Knudsen, E. B., Westergaard, N. J., Christensen, F. E., Massahi, S., Shortt, B., Spiga, D., Solstad, M. & Lefmann, K., 26 Jun 2016, In: Proceedings of S P I E - International Society for Optical Engineering. 9905, UNSP 990576.

  Research output: Contribution to journal › Conference article › Research › peer-review

  File
  5 Citations (Scopus)

• VESPA: The vibrational spectrometer for the European Spallation Source

  Fedrigo, A., Colognesi, D., Bertelsen, M., Hartl, M., Lefmann, K., Deen, P. P., Strobl, M., Grazzi, F. & Zoppi, M., 2 Jun 2016, In: Review of Scientific Instruments. 87, 6, 065101.

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  11 Citations (Scopus)
• 2015

  Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO₄

  Toft-Petersen, R., Reehuis, M., Jensen, T. B. S., Andersen, N. H., Li, J., Le, M. D., Laver, M., Niedermayer, C., Klemke, B., Lefmann, K. & Vaknin, D., 2015, In: Physical Review B. 92, 2, 9 p., 024404.

  Research output: Contribution to journal › Journal article › Research › peer-review

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  42 Citations (Scopus)

  24 Downloads (Pure)

• CAMEA ESS - The Continuous Angle Multi-Energy Analysis Indirect Geometry Spectrometer for the European Spallation Source

  Freeman, P. G., Birk, J. O., Marko, M., Bertelsen, M., Christensen, N. B., Lefmann, K., Jacobsen, J., Niedermayer, C., Juranyi, F. & Ronnow, H. M., 23 Jan 2015, In: Journal of Physics: Conference Series (Online). 83, 7 p., 03005.

  Research output: Contribution to journal › Conference article › Research › peer-review
  19 Citations (Scopus)

• Competing superconducting and magnetic order parameters and field-induced magnetism in electron-doped Ba(Fe1-xCox)(2)As-2

  Larsen, J., Uranga, B. M., Stieper, G., Holm, S. L., Bernhard, C., Wolf, T., Lefmann, K., Andersen, B. M. & Niedermayer, C., 13 Jan 2015, In: Physical Review B. 91, 2, 10 p., 025404.

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  8 Citations (Scopus)

• Dynamic rotor mode in antiferromagnetic nanoparticles

  Lefmann, K., Garde, J., Jacobsen, H., Hedegård, P., Ancona, S. N., Bahl, C. R. H. & Kuhn, L. T., 2015, In: Physical Review B. 91, 10 p., 094421.

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  2 Citations (Scopus)

• Field-induced interplanar magnetic correlations in the high-temperature superconductor La_1.88Sr_0.12CuO₄

  Rømer, A. T., Ray, P., Jacobsen, H., Udby, L., Andersen, B. M., Bertelsen, M., Holm, S. L., Christensen, N. B., Toft-Petersen, R., Skoulatos, M., Laver, M., Schneidewind, A., Link, P., Oda, M., Ido, M., Nomono, N. & Lefmann, K., 11 May 2015, In: Physical Review B. 91, 174507.

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  6 Citations (Scopus)

• Neutron guide-split: A high performance guide bundle concept for elliptical guides

  Holm, S. L., Rasmussen, N., Høpfner, L., Bertelsen, M., Voigt, J., Andersen, K. H. & Lefmann, K., 11 May 2015, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 782, p. 1-8 8 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  1 Citation (Scopus)

• Polarized neutron powder diffraction studies of antiferromagnetic order in bulk and nanoparticle NiO

  Brok, E., Lefmann, K., Deen, P. P., Lebech, B., Jacobsen, H., G., N. & Frandsen, C., 26 Jan 2015, In: Physical Review B. 91, 014431.

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  14 Citations (Scopus)

• Prediction of beam hardening artefacts in computed tomography using Monte Carlo simulations

  Thomsen, M., Knudsen, E. B., Willendrup, P. K., Bech, M., Willner, M., Pfeiffer, F., Poulsen, M., Lefmann, K. & Feidenhans'l, R. K., 2015, In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 342, p. 314-320 7 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  10 Citations (Scopus)

• Simulation of waviness in neutron guides

  Hansen, U. B., Bertelsen, M., Lefmann, K. & Bergbäck Knudsen, E., 31 Dec 2015, In: Journal of Neutron Research. 18, 2-3, 45-59.

  Research output: Contribution to journal › Journal article › Research › peer-review
  4 Citations (Scopus)
• 2014

  A compact time-of-flight SANS instrument optimised for measurements of small sample volumes at the European Spallation Source

  Kynde, S., Kleno, K. H., Nagy, G., Mortensen, K., Lefmann, K., Kohlbrecher, J. & Arleth, L., 11 Nov 2014, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 764, p. 133-141

  Research output: Contribution to journal › Journal article › Research › peer-review
  8 Citations (Scopus)

• Corrigendum to "Bi-spectral extraction through elliptic neutron guides " [Nucl.Inst.and Meth A717(2013) 69-76]

  Jacobsen, H., Lieutenant, K., Zendlle, C. & Lefmann, K., 11 Apr 2014, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 743, p. 160-160

  Research output: Contribution to journal › Comment/debate › Research › peer-review
  1 Citation (Scopus)

• Experimental evidence for lamellar magnetism in hemo-ilmenite by polarized neutron scattering

  Brok, E., Sales, M., Lefmann, K., Kuhn, L. T., Schmidt, W. F., Roessli, B., McEnroe, S. A. & Harrison, R. J., 26 Feb 2014, In: Physical Review B. 89, 054430.

  Research output: Contribution to journal › Journal article › Research › peer-review
  7 Citations (Scopus)

• Investigation of propagation algorithms for ray-tracing simulation of polarized neutrons

  Knudsen, E. B., Rømer, A. T., Willendrup, P. K., Christiansen, P. & Lefmann, K., 1 Jan 2014, In: Journal of Neutron Research. 17, 1, p. 27-34

  Research output: Contribution to journal › Journal article › Research › peer-review
  6 Citations (Scopus)

• Magnetic properties of nano-scale hematite, α-Fe₂O₃, studied by time-of-flight inelastic neutron spectroscopy

  Hill, A. H., Jacobsen, H., Ross Stewart, J., Jiao, F., Jensen, N. P., Holm, S. L., Mutka, H., Seydel, T., Harrison, A. & Lefmann, K., 25 Jan 2014, In: Journal of Chemical Physics. 140, 9 p., 044709.

  Research output: Contribution to journal › Journal article › Research › peer-review

• Magnetic properties of ultra-small goethite nanoparticles

  Brok, E., Frandsen, C., Madsen, D. E., Jacobsen, H., Birk, J. O., Lefmann, K., Bendix, J., Pedersen, K. S., Boothroyd, C. B., Berhe, A. A., Simeoni, G. G. & Mørup, S., 9 Oct 2014, In: Journal of Physics D: Applied Physics. 47, 36, 365003.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access
  34 Citations (Scopus)

• McStas: Past, present and future

  Willendrup, P. K., Farhi, E., Knudsen, E., Filges, U. & Lefmann, K., 19 Feb 2014, In: Journal of Neutron Research. 17, 1, p. 35-43

  Research output: Contribution to journal › Journal article › Research › peer-review
  66 Citations (Scopus)

• New developments in the McStas neutron instrument simulation package

  Willendrup, P. K., Knudsen, E. B., Klinkby, E. B., Nielsen, T. N., Farhi, E., Filges, U. & Lefmann, K., 1 Aug 2014, In: Journal of Physics: Conference Series (Online). 528, 1, 012035.

  Research output: Contribution to journal › Journal article › Research › peer-review
  11 Citations (Scopus)

• Prismatic analyzer concept for neutron spectrometers

  Birk, J. O., Marko, M., Freeman, P. G., Jacobsen, J., Hansen, R. L., Niedermayer, C., Christensen, N. B., Måsson, M., Rønnow, H. M. & Lefmann, K., 1 Nov 2014, In: Review of Scientific Instruments. 85, 11, 113908.

  Research output: Contribution to journal › Journal article › Research › peer-review
  20 Citations (Scopus)

• Simulations of chopper jitter at the LET neutron spectrometer at the ISIS TS2

  Klenø, K. H., Lefmann, K., Willendrup, P. K., Christiansen, P. & Bewley, R., 9 Apr 2014, In: Journal of Neutron Research. 17, 2, p. 77-85

  Research output: Contribution to journal › Journal article › Research › peer-review

• Special Issue: Workshop on the Monte Carlo Simulation of Neutron Scattering Instruments MCNSI7

  Lefmann, K. & Šaroun, J., 1 Jan 2014, In: Journal of Neutron Research. 17, 1, p. 3-3

  Research output: Contribution to journal › Journal article › Research › peer-review

• Visualisation by high resolution synchrotron X-ray phase contrast micro-tomography of gas films on submerged superhydrophobic leaves

  Lauridsen, T., Glavina, K., Colmer, T. D., Winkel, A., Irvine, S., Lefmann, K., Feidenhans'l, R. K. & Pedersen, O., 1 Oct 2014, In: Journal of Structural Biology. 188, 1, p. 61-70

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access
  20 Citations (Scopus)
• 2013

  50 Years of Swiss Neutron Diffraction Instrumentation

  Fischer, P., Schefer, J., Keller, L., Zaharko, O., Pomjakushin, V., Aliouane, N., Frontzek, M., Holm, S. L., Lefmann, K. & Christensen, M., 2 Aug 2013, In: Swiss Neutron News. 42, p. 4-15 11 p.

  Research output: Contribution to journal › Journal article › Research

  File
  1198 Downloads (Pure)

• A Monte Carlo Simulation of Neutron Instrument Resolution Functions: Proceedings of 10th International Conference on Quasielastic Neutron Scattering and 5th Workshop on Inelastic Neutron Spectrometers

  Vickery, A., Udby, L., Violini, N., Voigt, J., Deen, P. P. & Lefmann, K., 12 Nov 2013, In: Journal of the Physical Society of Japan. 82, Supplement A , 9 p., SA037.

  Research output: Contribution to journal › Conference article › Research › peer-review

• Bi-spectral extraction through elliptic neutron guides

  Jacobsen, H., Lieutenant, K., Zendlle, C. & Lefmann, K., 21 Jul 2013, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 717, p. 69-76

  Research output: Contribution to journal › Journal article › Research › peer-review
  20 Citations (Scopus)

• E-learning neutron scattering

  Udby, L., Jensen, P., Lefmann, K., Bruun, J., Willendrup, P. K., Nielsen, J. S. B., Schober, H., Neuhaus, J. & Pulz, J., 1 Feb 2013, In: Neutron News. 24, 1, p. 18-23 6 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  1 Citation (Scopus)

• "European Spallation Source - Technical Design Report"

  Arleth, L., Bertelsen, M., Birk, J. O., Nunes Bordallo, H., Carlsen, H., Hansen, U. B., Holm, S. L., Høpfner, L., Jacobsen, H., Klenø, K. H., Kynde, S. A. R., Lefmann, K., Rasmussen, N., Sales, M., Skar-Gislinge, N., Skelboe, S., Theodor, K., Udby, L., Vickery, A. & Rod, T. H., 15 Apr 2013, Technical Design Report . ESS Lund ed. Lund, Sverige

  Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Research › peer-review

• Exploring performance of neutron guide systems using pinhole beam extraction

  Bertelsen, M., Jacobsen, H., Hansen, U. B., Carlsen, H. H. & Lefmann, K., 21 Nov 2013, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 729, p. 387-398

  Research output: Contribution to journal › Journal article › Research › peer-review
  19 Citations (Scopus)

• Glassy low-energy spin fluctuations and anisotropy gap in La1.88Sr0.12CuO4

  Rømer, A. T., Chang, J., Andersen, B. M., Lefmann, K., Christensen, N. B., Mähler, L., Gavilano, J., Gilardi, R., Niedermayer, C., Rønnow, H. M., Schniedewind, A., Link, P., Oda, M., Ido, M., Momono, N. & Mesot, J., 22 Apr 2013, In: Physical Review B. 87, 14, p. 144513

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access
  24 Citations (Scopus)

• McXtrace: a Monte Carlo software package for simulation of X-ray optics, beamlines, and experiments

  Bergbäck Knudsen, E., Prodi, A., Baltser, J., Thomsen, M., Willendrup, P. K., del Rio, M. S., Ferrero, C., Farhi, E., Haldrup, M. K., Vickery, A., Feidenhans'l, R. K., Mortensen, K., Nielsen, M. M., Poulsen, H. F., Schmidt, S. & Lefmann, K., 1 Jun 2013, In: Journal of Applied Crystallography. 46, Part 3, p. 679-696 18 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  76 Citations (Scopus)

• Measurement of unique magnetic and superconducting phases in oxygen-doped high-temperature superconductors La_2-xSr_xCuO_4+y

  Udby, L., Larsen, J., Christensen, N. B., Boehm, M., Niedermayer, C., Mohottala, H. E., Jensen, T. B. S., Toft-Petersen, R., Chou, F. C., Andersen, N. H., Lefmann, K. & Wells, B. O., 25 Nov 2013, In: Physical Review Letters. 111, 22, 5 p., 227001.

  Research output: Contribution to journal › Journal article › Research › peer-review
  16 Citations (Scopus)

• Nordic neutron Scattering Communities 2008-2013 - a bibliometric study

  Lefmann, K. & Bakke, A., 1 Aug 2013

  Research output: Other contribution › Communication

• Simulation of a suite of generic long-pulse neutron instruments to optimize the time structure of the European Spallation Source

  Lefmann, K., Klenø, K. H., Birk, J. O., Hansen, B. R., Holm, S. L., Knudsen, E., Lieutenant, K., von Moos, L., Sales, M., Willendrup, P. K. & Andersen, K. H., 2013, In: Review of Scientific Instruments. 84, 5, 9 p., 055106.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access
  14 Citations (Scopus)
• 2012

  Hindered Rotational Energy Barriers of BH₄ Tetrahedra in beta-Mg(BH₄)₍₂₎ from Quasielastic Neutron Scattering and DFT Calculations

  Blanchard, D., Maronsson, J. B., Riktor, M. D., Kheres, J., Sveinbjörnsson, D., Gil Bardaji, E., Léon, A., Juranyi, F., Wuttke, J., Lefmann, K., Hauback, B. C., Fichtner, M. & Vegge, T., 19 Jan 2012, In: Journal of Physical Chemistry C. 116, 2, p. 2013-2023 10 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  44 Citations (Scopus)

• Solitonic lattice and Yukawa forces in the rare-earth orthoferrite TbFeO³

  Artyukhin, S., Mostovoy, M., Jensen, N. P., Le, D., Prokes, K., de paula, V. G., Bordallo, H. N., Maljuk, A., Landsgesell, S., Ryll, H., Klemke, B., Paeckel, S., Kiefer, K., Lefmann, K., Kuhn, L. T. & Argyriou, D. N., 24 Jun 2012, In: Nature Materials. 11, 8, p. 694-699 6 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

  File
  72 Citations (Scopus)

  1909 Downloads (Pure)

• Systematic performance study of common neutron guide geometries

  Klenø, K. H., Lieutenant, K., Andersen, K. H. & Lefmann, K., 22 Dec 2012, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 696, p. 75-84 9 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  51 Citations (Scopus)

• Temperature dependence of the magnetization of canted spin structures

  Jacobsen, H., Lefmann, K., Brok, E., Frandsen, C. & Morup, S., 1 Sep 2012, In: Journal of Magnetism and Magnetic Materials. 324, 19, p. 3218-3222 4 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  10 Citations (Scopus)
• 2011

  Advanced simulations of x-ray beam propagation through CRL transfocators using ray-tracing and wavefront propagation methods

  Baltser, J., Vickery, A., Feidenhans'l, R. K., Lefmann, K., Chubar, O., Snigirev, A. & Vaughan, G., 23 Sep 2011, In: Proceedings of SPIE. 8141, p. 814111

  Research output: Contribution to journal › Conference article › Research › peer-review
  7 Citations (Scopus)

• A Monte Carlo approach for simulating the propagation of partially coherent x-ray beams

  Prodi, A., Feidenhans'l, R. K., Lefmann, K., Knudsen, E., Willendrup, P. K., Schmitt, S. & Ferrero, C., 23 Sep 2011, In: Proceedings of SPIE. 8141, p. 814108

  Research output: Contribution to journal › Conference article › Research › peer-review
  10 Citations (Scopus)

• Analysing neutron scattering data using McStas virtual experiments

  Udby, L., Willendrup, P. K., Knudsen, E., Niedermayer, C., Filges, U., Christensen, N. B., Farhi, E., Wells, B. O. & Lefmann, K., 1 Apr 2011, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 634, Suppl. 1, p. S138-S143

  Research output: Contribution to journal › Conference article › Research › peer-review

  23 Citations (Scopus)

• Eliminating line of sight in elliptic guides using gravitational curving

  Klenø, K. H., Willendrup, P. K., Lefmann, K. & Knudsen, E., 1 Apr 2011, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 634, Suppl. 1, p. S100-S103

  Research output: Contribution to journal › Conference article › Research › peer-review
  7 Citations (Scopus)

• ESS, en forskningsfacilitet i verdensklasse under opbygning i Lund

  Lefmann, K., Arleth, L., Christensen, N. B., Møller, S. P., Skelboe, S. & Willendrup, P. K., 1 Feb 2011, In: Kvant. 22, 1, p. 25-32

  Research output: Contribution to journal › Journal article › Communication

• High-field magnetic phase transitions and spin excitations in magnetoelectric LiNiPO4

  Toft-Petersen, R., Jensen, J., Jensen, T. B. S., Andersen, N. H., Christensen, N. B., Niedermayer, C., Kenzelmann, M., Skoulatos, M., Le, M. D., Lefmann, K., Hansen, S. R., Li, J., Zarestky, J. L. & Vaknin, D., 2 Aug 2011, In: Physical Review B Condensed Matter. 84, 5, p. 054408 10 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  34 Citations (Scopus)

• Magnetic field-induced closure of the spin excitation gap near optimal doping in La_2-xSr_xCuO₄: Proceedings of the International Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011 (NASCES11)

  Christensen ...[et al.], N. B., Chang, J., Razzoli, E. & Lefmann, K., 20 Dec 2011, In: Journal of the Physical Society of Japan. 80, Suppl. B, p. SB030 4 p.

  Research output: Contribution to journal › Conference article › Research › peer-review
  1 Citation (Scopus)