Local Jahn-Teller distortions and orbital ordering in Ba3Cu1+xSb2-xO9 investigated by neutron scattering

Li, Bing; Feygenson, Mikhail; Brown, Craig M.; Copley, John R. D.; Iida, Kazuki

doi:10.1103/PhysRevB.93.014423

Title: Local Jahn-Teller distortions and orbital ordering in Ba₃Cu_1+xSb_2-xO₉ investigated by neutron scattering

Journal Article · Fri Jan 15 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.014423· OSTI ID:1287023

Li, Bing ^[1]; Feygenson, Mikhail ^[2]; Brown, Craig M. ^[3]; Copley, John R. D. ^[3]; Iida, Kazuki ^[4]

Univ. of Virginia, Charlottesville, VA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Institute of Standards and Technology, Gaithersburg, MD (United States)
Research Center for Neutron Science and Technology, Ibaraki (Japan)

In this study, a spin-orbital quantum liquid state is theoretically proposed in the honeycomb lattice of Ba₃CuSb₂O₉, enabled by dynamic short-range correlations between the spin and orbital degrees of freedom. Using neutron diffraction, the local atomic structure of Ba₃Cu_1+xSb_2-xO₉ at x = 0 and 0.1 is obtained via the pair density function analysis. The results indicate that both compositions exhibit local Jahn-Teller (JT) distortions with the elongated CuO₃ octahedral configuration. In Ba₃Cu_1.1Sb_1.9O₉, JT ordering of the distorted CuO₃ octahedra gives rise to the orthorhombic symmetry with ferro-orbital order. On the other hand, in Ba₃CuSb₂O₉, even though the CuO₃ octahedra are JT distorted, there is no long-range ordering hence the symmetry is hexagonal. Furthermore, the local singlet excitation at 5.8 meV observed in Ba₃CuSb₂O₉ below 50 K is absent in Ba₃Cu_1.1Sb_1.9O₉. Instead, an excitation at 2.5 meV is observed in the latter, which is likely associated with short-range spin order.

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

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1287023

Journal Information:: Physical Review B, Vol. 93, Issue 1; ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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