期刊
PHYSICAL REVIEW LETTERS
卷 101, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.086404
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Novel States of Matter Induced by Frustration, Japan [19052008]
We have synthesized a new spinel oxide LiRh(2)O(4) with a mixed-valent configuration of Rh(3+) and Rh(4+). At room temperature, it is a paramagnetic metal, but on cooling, a metal-insulator transition occurs and a valence bond solid state is formed below 170 K. We argue that the formation of valence bond solid is promoted by a band Jahn-Teller transition at 230 K and the resultant confinement of t(2g) holes within the xy band. The band Jahn-Teller instability is also responsible for the observed enhanced thermoelectric power in the orbital-disordered phase above 230 K.
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