Kim Lefmann

Search results

• 2016

  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

  File
  42 Citations (Scopus)

  24 Downloads (Pure)

• 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)

• 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
  1199 Downloads (Pure)

• 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)

• 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)

• 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

  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)

• McStas-model of the Delft SESANS

  Knudsen, E., Udby, L., Willendrup, P. K., Lefmann, K. & Bouwman, W. G., 1 Jun 2011, In: Physica B: Condensed Matter. 406, 12, p. 2361-2364

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

• Spin reorientation in a-Fe₂O₃ nanoparticles induced by interparticle exchange interactions in a-Fe₂O₃/NiO nanocomposites

  Frandsen..[et al.], C., Lefmann, K., Lebech, B., Bahi, C. R. H., Brok, E., Ancona, S. N. & Theil Kuhn, L., 22 Dec 2011, In: Physical Review B Condensed Matter. 84, 21, p. 214435 10 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  13 Citations (Scopus)
• 2010

  Field-induced tomonaga-luttinger liquid phase two-leg spin 1/2 ladder with strong leg interactions

  Hong...[et al.], T., Kim, Y. H., Hotta, C. & Lefmann, K., 23 Sep 2010, In: Physical Review Letters. 105, 13, p. 137207 4 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  95 Citations (Scopus)
• 2009

  Anomalous spin waves in the commensurate-incommensurate magnetic phase transition in  LiNiPO₄

  Jensen, T. B. S., Christensen, N. B. & Lefmann, K., 2009, In: Physical Review B Condensed Matter. 79, 9, p. 092413

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

• Field-induced competing interactions for ferroelectric polarization in  LiNiPO₄

  Jensen, T. B. S., Christensen, N. B., Kenzelmnn, M., Rønnow, H. M., Niedermayer, C., Andersen, N. H., Lefmann, K., Schefer, J., Zimmermann, M. V., Li, J., Zarestsky, J. L. & Vaknin, D., 2009, In: Physical Review B Condensed Matter. 79, 9, p. 092412

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

• Magnetic-field-induced soft-mode quantum phase transition in the high-temperature superconductor La_1.855 Sr_0.145 CuO₄: An inelastic neutron-scattering study

  Chang, J., Christensen, N. B. & Lefmann, K., 2009, In: Physical Review Letters. 102, 17, p. 177006

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

• Magnetic ordering in electronically phase-separated La(2-x)Sr(x)CuO(4+y): Neutron diffraction experiments

  Udby, L., Andersen, N. H., Chou, F. C., Christensen, N. B., Emery, S. B., Lefmann, K., Lynn, J. W., Mohottala, H. E., Niedermayer, C. & Wells, B. O., 2009, In: Physical Review B Condensed Matter. 80, p. 014505 5 p.

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

• Magnetic ordering in electronically phase-separated La_2-x Sr_x CuO_4+y: Neutron diffraction experiments

  Udby, L., Chou, F. C., Christensen, N. B., Emery, S. B., Lefmann, K., Lynn, J. W., Mohottala, H. E., Niedermayer, C. & Wells, B. O., 6 Aug 2009, In: Physical Review B - Condensed Matter and Materials Physics. 80, 1, 014505.

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

• Neutron optics and Monte Carlo simulations in NMI3

  Böni, P. & Lefmann, K., 2009, In: Neutron News. 20, 1, p. 26-29 3 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
• 2008

  Avoided crossing of rattler modes in thermoelectric materials

  Christensen, M., Abrahamsen, A. B., Christensen, N. B., Juranyi, F., Andersen, N. H., Lefmann, K., Andreasson, J., Bahl, CRH. & Iversen, B. B., 2008, In: Nature Materials. 7, 10, p. 811-815

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

• Reduction of data from inverted-geometry time-of-flight instruments

  Tregenna-Piggott, P. L. W., Juryani, F., Christiansen, P., Willendrup, P. & Lefmann, K., 2008, In: Journal of Neutron Research. 16, 1&2, p. 13-22 9 p.

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

• Simulation of a multiple-wavelength time-of-fligt neutron spectrometer for a long-pulsed spallation source

  Lefmann, K., Schober, H. & Mezei, F., 2008, In: Measurement Science and Technology. 19, 3, p. 034025 12 p.

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

• Tailored instrumentation for long-pulse neutron spallation sources

  Schober, H., Farhi, E., Mezei, F., Andersen, K., Bentley, P. M., Christiansen, P. & Lefmann, K., 2008, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 589, 1, p. 34-46 12 p.

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

• Uniform spin wave modes in antiferromagnetic nanoparticles with uncompensated moments

  Bahl, C. R. H., Garde, J., Lefmann, K., Jensen, T. B. S., Lindegård, P-A., Madsen, D. E. & Mørup, S., 2008, In: European Physical Journal B. Condensed Matter and Complex Systems. 62, 1, p. 53-57 22 p.

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

• Virtual experiments: the ultimate aim of neutron ray-tracing simulations

  Lefmann, K., Willendrup, P. K., Udby, L., Lebech, B., Mortensen, K., Birk, J. O., Klenø, K. H., Knudsen, E., Christiansen, P., Saroun, J., Kulda, J., Filges, U., Konnecke, M., Tregenna-Piggott, P., Peters, J., Lieutenant, K., Zsigmond, G., Bentley, P. & Fahri, E., 2008, In: Journal of Neutron Research. 16, 3-4, p. 97-111 15 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  31 Citations (Scopus)
• 2006

  Inelastic neutron scattering experiments with the monochromatic imaging mode of the RITA-II spectrometer

  Bahl, C. R. H., Lefmann, K., Abrahamsen, A. B., Rønnow, H. M., Saxild, F., Jensen, T. B. S., Udby, L. & Andersen, N. H., 1 May 2006, In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 246, 2, p. 452-462

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

  22 Citations (Scopus)