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|a 10.1103/PhysRevX.5.041004
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|a Bhobe, P. A.
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245 _ _ |a Electronic Structure Evolution across the Peierls Metal-Insulator Transition in a Correlated Ferromagnet
260 _ _ |a College Park, Md.
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|c 2015
336 7 _ |a Journal Article
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520 _ _ |a Transition metal compounds often undergo spin-charge-orbital ordering due to strong electron-electron correlations. In contrast, low-dimensional materials can exhibit a Peierls transition arising from low-energy electron-phonon-coupling-induced structural instabilities. We study the electronic structure of the tunnel framework compound K2Cr8O16, which exhibits a temperature-dependent (T-dependent) paramagnetic-to-ferromagnetic-metal transition at TC=180  K and transforms into a ferromagnetic insulator below TMI=95  K. We observe clear T-dependent dynamic valence (charge) fluctuations from above TC to TMI, which effectively get pinned to an average nominal valence of Cr+3.75 (Cr4+∶Cr3+ states in a 3∶1 ratio) in the ferromagnetic-insulating phase. High-resolution laser photoemission shows a T-dependent BCS-type energy gap, with 2G(0)∼3.5(kBTMI)∼35  meV. First-principles band-structure calculations, using the experimentally estimated on-site Coulomb energy of U∼4  eV, establish the necessity of strong correlations and finite structural distortions for driving the metal-insulator transition. In spite of the strong correlations, the nonintegral occupancy (2.25 d−electrons/Cr) and the half-metallic ferromagnetism in the t2g up-spin band favor a low-energy Peierls metal-insulator transition.
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|a Eguchi, R.
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|a Shin, S.
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