Band Jahn-Teller Instability and Formation of Valence Bond Solid in a Mixed-Valent Spinel Oxide LiRh2O4

Abstract

We have synthesized a new spinel oxide LiRh2O4 with a mixed-valent configuration of Rh3+ and Rh4+. 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 t2g 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.

7 pages, 4 figures

References in corpus (10)

• Pyrochlore Antiferromagnet: A Three-Dimensional Quantum Spin Liquid
• Local spin resonance and spin-Peierls-like phase transition in a geometrically frustrated antiferromagnet
• Long Range Charge Ordering in Magnetite Below the Verwey Transition
• Orbitally-driven Peierls state in spinels
• "Pudding mold" band drives large thermopower in Na${}_x$CoO${}_2$
• Orbital and spin chains in ZnV2O4
• Magnetic transition and orbital degrees of freedom in vanadium spinels
• The electronic structure of the heavy fermion metal $Li{V}_2{O}_4$
• Electronic structure of spinel-type LiV_2O_4
• Electronic Structure and Heavy Fermion Behavior in LiV_2O_4

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