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

Maharaj, D. D.; Sala, G.; Marjerrison, C. A.; Stone, M. B.; Greedan, J. E.; Gaulin, B. D.

doi:10.1103/PhysRevB.98.104434

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

Journal Article · Fri Sep 28 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.104434· OSTI ID:1493992

Maharaj, D. D. ^[1]; Sala, G. ^[2]; Marjerrison, C. A. ^[1]; Stone, M. B. ^[3]; Greedan, J. E. ^[1]; Gaulin, B. D. ^[4]

McMaster Univ., Hamilton, ON (Canada)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); McMaster Univ., Hamilton, ON (Canada)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
McMaster Univ., Hamilton, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada)

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 t_2g 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 T_N scales with the top of the spin-wave band in all members of these families that display long-range order.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1493992

Alternate ID(s):: OSTI ID: 1474770

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 10 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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