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Direct experimental observation of the molecular J eff=3/2 ground state in the lacunar spinel GaTa4Se8 [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
Article numbers 782 : digital, PDF file
Additional Creators:
Argonne National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, Brookhaven National Laboratory (BNL) Research Center, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Strong spin-orbit coupling lifts the degeneracy of t2g orbitals in 5d transition-metal systems, leaving a Kramers doublet and quartet with effective angular momentum of Jeff = 1/2 and 3/2, respectively. These spin-orbit entangled states can host exotic quantum phases such as topological Mott state, unconventional superconductivity, and quantum spin liquid. The lacunar spinel GaTa4Se8 was theoretically predicted to form the molecular Jeff = 3/2 ground state. Experimental verification of its existence is an important first step to exploring the consequences of the Jeff = 3/2 state. Here, we report direct experimental evidence of the Jeff = 3/2 state in GaTa4Se8 by means of excitation spectra of resonant inelastic x-rays scattering at the Ta L3 and L2 edges. In conclusion, we found that the excitations involving the Jeff = 1/2 molecular orbital were absent only at the Ta L2 edge, manifesting the realization of the molecular Jeff = 3/2 ground state in GaTa4Se8.
Report Numbers:
E 1.99:1413991
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Note:
Published through SciTech Connect.
10/04/2017.
"136637"
Nature Communications 8 1 ISSN 2041-1723 AM
Min Yong Jeong; Seo Hyoung Chang; Beom Hyun Kim; Jae -Hoon Sim; Ayman Said; Diego Casa; Thomas Gog; Etienne Janod; Laurent Cario; Seiji Yunoki; Myung Joon Han; Jungho Kim.
National Research Foundation (NRF) of Korea
Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
Funding Information:
AC02-06CH11357
View MARC record | catkey: 23757533