2008/06/23 by Yoshihiko Okamoto, Seiji Niitaka, Masaya Uchida +11 · 66 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Condensed matter physics #Crystallography #Instability #Ion #Jahn–Teller effect #Magnetic and transport properties of perovskites and related materials #Materials science #Oxide #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Seebeck coefficient #Spinel #Thermodynamics #Thermoelectric effect #Valence (chemistry) #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.101.086404
published in Physical Review Letters 101(8), 086404 (American Physical Society) · 7 pages, 4 figures
arxiv created 2008/06/23 · openalex publication_date 2008/08/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.