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Title: Spin gaps in the ordered states of La 2 Li X O 6 ( X = Ru , Os ) and their relation to the distortion of the cubic double perovskite structure in 4 d 3 and 5 d 3 magnets

Abstract

Time-of-flight inelastic neutron scattering measurements have been carried out on polycrystalline samples of the 4d 3 and 5d 3 double pervoskite antiferromagnets La 2LiRuO 6 and La 2LiOsO 6. These reveal the development of an inelastic spin gap in La 2LiRuO 6 and La 2LiOsO 6 of ~1.8(8) and 6(1) meV, below their respective ordering temperatures TN, ~23.8 and 30 K. The bandwidths of the spin excitations are shown to be ~5.7(9)and12(1)meV, respectively, at low temperatures. Spin gaps are surprising in such magnets as the t 2g levels of Ru 5+ or Os 5+ are expected to be half-filled, resulting in an anticipated orbital singlet for both materials. We compare these results in monoclinic double perovskites La 2LiRuO 6 and La 2LiOsO 6 with those in cubic Ba 2YRuO 6 and Ba 2YOsO 6 as well as with those in other monoclinic La 2NaRuO 6,La 2NaOsO 6, and Sr 2ScOsO 6 and model the inelastic magnetic scattering with linear spin-wave theory using minimal anisotropic exchange interactions. We discuss the possible role of the distortion of the face-centered-cubic double perovskite structure on the spin gap formation and geometric frustration in these materials and show that T N scales with the topmore » of the spin-wave band in all members of these families that display long-range order.« less

Authors:
 [1];  [2];  [1];  [3];  [1];  [4]
  1. McMaster Univ., Hamilton, ON (Canada)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); McMaster Univ., Hamilton, ON (Canada)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. McMaster Univ., Hamilton, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1493992
Alternate Identifier(s):
OSTI ID: 1474770
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Maharaj, D. D., Sala, G., Marjerrison, C. A., Stone, M. B., Greedan, J. E., and Gaulin, B. D. Spin gaps in the ordered states of La2LiXO6(X=Ru,Os) and their relation to the distortion of the cubic double perovskite structure in 4d3 and 5d3 magnets. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.104434.
Maharaj, D. D., Sala, G., Marjerrison, C. A., Stone, M. B., Greedan, J. E., & Gaulin, B. D. Spin gaps in the ordered states of La2LiXO6(X=Ru,Os) and their relation to the distortion of the cubic double perovskite structure in 4d3 and 5d3 magnets. United States. doi:10.1103/PhysRevB.98.104434.
Maharaj, D. D., Sala, G., Marjerrison, C. A., Stone, M. B., Greedan, J. E., and Gaulin, B. D. Fri . "Spin gaps in the ordered states of La2LiXO6(X=Ru,Os) and their relation to the distortion of the cubic double perovskite structure in 4d3 and 5d3 magnets". United States. doi:10.1103/PhysRevB.98.104434. https://www.osti.gov/servlets/purl/1493992.
@article{osti_1493992,
title = {Spin gaps in the ordered states of La2LiXO6(X=Ru,Os) and their relation to the distortion of the cubic double perovskite structure in 4d3 and 5d3 magnets},
author = {Maharaj, D. D. and Sala, G. and Marjerrison, C. A. and Stone, M. B. and Greedan, J. E. and Gaulin, B. D.},
abstractNote = {Time-of-flight inelastic neutron scattering measurements have been carried out on polycrystalline samples of the 4d3 and 5d3 double pervoskite antiferromagnets La2LiRuO6 and La2LiOsO6. These reveal the development of an inelastic spin gap in La2LiRuO6 and La2LiOsO6 of ~1.8(8) and 6(1) meV, below their respective ordering temperatures TN, ~23.8 and 30 K. The bandwidths of the spin excitations are shown to be ~5.7(9)and12(1)meV, respectively, at low temperatures. Spin gaps are surprising in such magnets as the t2g levels of Ru5+ or Os5+ are expected to be half-filled, resulting in an anticipated orbital singlet for both materials. We compare these results in monoclinic double perovskites La2LiRuO6 and La2LiOsO6 with those in cubic Ba2YRuO6 and Ba2YOsO6 as well as with those in other monoclinic La2NaRuO6,La2NaOsO6, and Sr2ScOsO6 and model the inelastic magnetic scattering with linear spin-wave theory using minimal anisotropic exchange interactions. We discuss the possible role of the distortion of the face-centered-cubic double perovskite structure on the spin gap formation and geometric frustration in these materials and show that TN scales with the top of the spin-wave band in all members of these families that display long-range order.},
doi = {10.1103/PhysRevB.98.104434},
journal = {Physical Review B},
number = 10,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}

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