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Title: Neutron scattering studies of the magnetic order in RNi{sub 2}B{sub 2}C

Abstract

Neutron diffraction was used to study magnetic order of RNi{sub 2}B{sub 2}C (R=Er, Ho, Dy). For Er the system orders antiferromagnetically at T{sub {ital N}}=6.8 K, and this long range order coexists with superconductivity (T{sub {ital c}}=11 K). The magnetic structure is an incommensurate, transversely polarized spin-density-wave state, with the modulation wave vector {delta} along the {ital a} axis and the moments along {ital b}. {delta} has a temperature-independent value of 0.5526 (2{pi}/{ital a}), with the structure squaring up at low temperatures. For R=Ho the moments also prefer to reside in the {ital a}{endash}{ital b} plane, but initially an incommensurate {ital c}-axis spiral state forms upon cooling, with {ital T}{sub {ital N}}{approx_equal}{ital T}{sub {ital C}}{approx_equal}8 K. This {ital c}-axis spiral consists of ferromagnetic sheets of Ho moments in the {ital a}{endash}{ital b} plane, but with each sheet rotated by 163{degree} as one proceeds along the {ital c} axis. Small {ital a}-axis peaks are also observed above the reentrant superconducting transition over a narrow temperature range, but the {ital c}-axis peaks dominate. Just below the reentrant transition at 5 K the magnetic system locks in to a simple commensurate antiferromagnetic structure, which permits superconductivity to be restored. The {ital c}-axis spiral,more » the {ital a}-axis component, the commensurate antiferromagnetic structure, and the superconducting phase are all in a delicate balance energetically, and this balance may be easily shifted by subtle changes in composition, magnetic field, and pressure. DyNi{sub 2}B{sub 2}C orders antiferromagnetically at {ital T}{sub {ital N}}=11 K, with the same commensurate antiferromagnetic structure as found for the holmium material at low temperature. The existence of superconductivity in some samples of DyNi{sub 2}B{sub 2}C is consistent with the antiferromagnetic structure observed. {copyright} {ital 1996 American Institute of Physics.}« less

Authors:
;  [1];  [2]; ; ;  [3];  [4]
  1. Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
  2. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  3. Tata Institute of Fundamental Research, Bombay 400 005 (India)
  4. CNRS, UPR-209, 92195 Meudon, Cedex (France)
Publication Date:
OSTI Identifier:
282085
Report Number(s):
CONF-951101-
Journal ID: JAPIAU; ISSN 0021-8979; TRN: 96:018967
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 79; Journal Issue: 8; Conference: 40. conference on magnetism and magnetic materials, Philadelphia, PA (United States), 6-9 Nov 1995; Other Information: PBD: Apr 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ERBIUM CARBIDES; MAGNETIC PROPERTIES; ERBIUM BORIDES; HOLMIUM CARBIDES; HOLMIUM BORIDES; NICKEL BORIDES; NICKEL CARBIDES; DYSPROSIUM CARBIDES; DYSPROSIUM BORIDES; NEUTRON DIFFRACTION; SUPERCONDUCTIVITY; ORDER-DISORDER TRANSFORMATIONS; CRYSTAL-PHASE TRANSFORMATIONS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; SPIN DENSITY WAVES; MAGNETIC ORDERING; MAGNETIC STRUCTURE

Citation Formats

Lynn, J W, Huang, Q, University of Maryland, College Park, Maryland 20742, Sinha, S K, Hossain, Z, Gupta, L C, Nagarajan, R, and Godart, C. Neutron scattering studies of the magnetic order in RNi{sub 2}B{sub 2}C. United States: N. p., 1996. Web. doi:10.1063/1.362150.
Lynn, J W, Huang, Q, University of Maryland, College Park, Maryland 20742, Sinha, S K, Hossain, Z, Gupta, L C, Nagarajan, R, & Godart, C. Neutron scattering studies of the magnetic order in RNi{sub 2}B{sub 2}C. United States. https://doi.org/10.1063/1.362150
Lynn, J W, Huang, Q, University of Maryland, College Park, Maryland 20742, Sinha, S K, Hossain, Z, Gupta, L C, Nagarajan, R, and Godart, C. Mon . "Neutron scattering studies of the magnetic order in RNi{sub 2}B{sub 2}C". United States. https://doi.org/10.1063/1.362150.
@article{osti_282085,
title = {Neutron scattering studies of the magnetic order in RNi{sub 2}B{sub 2}C},
author = {Lynn, J W and Huang, Q and University of Maryland, College Park, Maryland 20742 and Sinha, S K and Hossain, Z and Gupta, L C and Nagarajan, R and Godart, C},
abstractNote = {Neutron diffraction was used to study magnetic order of RNi{sub 2}B{sub 2}C (R=Er, Ho, Dy). For Er the system orders antiferromagnetically at T{sub {ital N}}=6.8 K, and this long range order coexists with superconductivity (T{sub {ital c}}=11 K). The magnetic structure is an incommensurate, transversely polarized spin-density-wave state, with the modulation wave vector {delta} along the {ital a} axis and the moments along {ital b}. {delta} has a temperature-independent value of 0.5526 (2{pi}/{ital a}), with the structure squaring up at low temperatures. For R=Ho the moments also prefer to reside in the {ital a}{endash}{ital b} plane, but initially an incommensurate {ital c}-axis spiral state forms upon cooling, with {ital T}{sub {ital N}}{approx_equal}{ital T}{sub {ital C}}{approx_equal}8 K. This {ital c}-axis spiral consists of ferromagnetic sheets of Ho moments in the {ital a}{endash}{ital b} plane, but with each sheet rotated by 163{degree} as one proceeds along the {ital c} axis. Small {ital a}-axis peaks are also observed above the reentrant superconducting transition over a narrow temperature range, but the {ital c}-axis peaks dominate. Just below the reentrant transition at 5 K the magnetic system locks in to a simple commensurate antiferromagnetic structure, which permits superconductivity to be restored. The {ital c}-axis spiral, the {ital a}-axis component, the commensurate antiferromagnetic structure, and the superconducting phase are all in a delicate balance energetically, and this balance may be easily shifted by subtle changes in composition, magnetic field, and pressure. DyNi{sub 2}B{sub 2}C orders antiferromagnetically at {ital T}{sub {ital N}}=11 K, with the same commensurate antiferromagnetic structure as found for the holmium material at low temperature. The existence of superconductivity in some samples of DyNi{sub 2}B{sub 2}C is consistent with the antiferromagnetic structure observed. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.362150},
url = {https://www.osti.gov/biblio/282085}, journal = {Journal of Applied Physics},
number = 8,
volume = 79,
place = {United States},
year = {1996},
month = {4}
}