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Title: Piezomagnetism and magnetoelastic memory in uranium dioxide

Uranium dioxide (UO 2) is a prime nuclear fuel and perhaps the most thoroughly studied actinide material to date. Its thermal and magnetic properties remain, however, a puzzle resulting from strong couplings between magnetism and lattice vibrations. The magnetic state of this cubic material is characterized by a non- collinear antiferromagnetic structure and multidomain Jahn-Teller distortions that could be behind novel thermal properties. Here we show that single crystals of UO 2, subjected to magnetic fields up to 95 T in the magnetic state, exhibit the abrupt appearance of positive linear magnetostriction leading to a trigonal distortion. Upon reversal of the field the linear term also reverses sign, a hallmark of piezomagnetism. The switching phenomenon occurs at ± 18 T and persists during subsequent field reversals, demonstrating robust magneto-elastic memory. This is the first example of piezomagnetism in an actinide spin system and the magneto-elastic memory loop here is nearly an order of magnitude wider in field than those previously observed, making UO 2 the hardest piezomagnet known. The possibility of an inverse phase with reduced magnetocrystalline anisotropy is considered to explain these effects.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ; ORCiD logo [3] ;  [1] ;  [1] ;  [1] ;  [1] ;  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Aix-Marseille Univ., and CNRS/IN2P3, Marseille (France)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Maria Curie-Sklodowska Univ., Lublin (Poland). Inst. of Physics
  4. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Report Number(s):
INL/JOU-16-38685; LA-UR-16-21871
Journal ID: ISSN 2041-1723
Grant/Contract Number:
AC07-05ID14517; DMR-212 1157490; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; piezomagnetism; uranium dioxide
OSTI Identifier:
1369434
Alternate Identifier(s):
OSTI ID: 1409763

Jaime, M., Saul, A., Salamon, M., Zapf, V. S., Harrison, N., Durakiewicz, T., Lashley, J. C., Andersson, D. A., Stanek, C. R., Smith, J. L., and Gofryk, K.. Piezomagnetism and magnetoelastic memory in uranium dioxide. United States: N. p., Web. doi:10.1038/s41467-017-00096-4.
Jaime, M., Saul, A., Salamon, M., Zapf, V. S., Harrison, N., Durakiewicz, T., Lashley, J. C., Andersson, D. A., Stanek, C. R., Smith, J. L., & Gofryk, K.. Piezomagnetism and magnetoelastic memory in uranium dioxide. United States. doi:10.1038/s41467-017-00096-4.
Jaime, M., Saul, A., Salamon, M., Zapf, V. S., Harrison, N., Durakiewicz, T., Lashley, J. C., Andersson, D. A., Stanek, C. R., Smith, J. L., and Gofryk, K.. 2017. "Piezomagnetism and magnetoelastic memory in uranium dioxide". United States. doi:10.1038/s41467-017-00096-4. https://www.osti.gov/servlets/purl/1369434.
@article{osti_1369434,
title = {Piezomagnetism and magnetoelastic memory in uranium dioxide},
author = {Jaime, M. and Saul, A. and Salamon, M. and Zapf, V. S. and Harrison, N. and Durakiewicz, T. and Lashley, J. C. and Andersson, D. A. and Stanek, C. R. and Smith, J. L. and Gofryk, K.},
abstractNote = {Uranium dioxide (UO2) is a prime nuclear fuel and perhaps the most thoroughly studied actinide material to date. Its thermal and magnetic properties remain, however, a puzzle resulting from strong couplings between magnetism and lattice vibrations. The magnetic state of this cubic material is characterized by a non- collinear antiferromagnetic structure and multidomain Jahn-Teller distortions that could be behind novel thermal properties. Here we show that single crystals of UO2, subjected to magnetic fields up to 95 T in the magnetic state, exhibit the abrupt appearance of positive linear magnetostriction leading to a trigonal distortion. Upon reversal of the field the linear term also reverses sign, a hallmark of piezomagnetism. The switching phenomenon occurs at ± 18 T and persists during subsequent field reversals, demonstrating robust magneto-elastic memory. This is the first example of piezomagnetism in an actinide spin system and the magneto-elastic memory loop here is nearly an order of magnitude wider in field than those previously observed, making UO2 the hardest piezomagnet known. The possibility of an inverse phase with reduced magnetocrystalline anisotropy is considered to explain these effects.},
doi = {10.1038/s41467-017-00096-4},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {7}
}