Peierls Mechanism of the Metal-Insulator Transition in Ferromagnetic Hollandite K2Cr8O16
| Autor: | Toriyama, T., Nakao, A., Yamaki, Y., Nakao, H., Murakami, Y., Hasegawa, K., Isobe, M., Ueda, Y., Ushakov, A. V., Khomskii, D. I., Streltsov, S. V., Konishi, T., Ohta, Y. |
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| Rok vydání: | 2011 |
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| Zdroj: | Phys. Rev. Lett. 107, 266402 (2011) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.107.266402 |
| Popis: | Synchrotron X-ray diffraction experiment shows that the metal-insulator transition occurring in a ferromagnetic state of a hollandite K$_2$Cr$_8$O$_{16}$ is accompanied by a structural distortion from the tetragonal $I4/m$ to monoclinic $P112_{1}/a$ phase with a $\sqrt{2}\times\sqrt{2}\times 1$ supercell. Detailed electronic structure calculations demonstrate that the metal-insulator transition is caused by a Peierls instability in the quasi-one-dimensional column structure made of four coupled Cr-O chains running in the $c$-direction, leading to the formation of tetramers of Cr ions below the transition temperature. This furnishes a rare example of the Peierls transition of fully spin-polarized electron systems. Comment: Phys. Rev. Lett., in press, 5 pages, 3 figures |
| Databáze: | arXiv |
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