Peierls Mechanism of the Metal-insulator Transition in Ferromagnetic Hollandite K 2Cr 8O 16
Synchrotron x-ray diffraction experiment shows that the metal-insulator transition occurring in a ferromagnetic state of a hollandite K 2Cr 8O 16 is accompanied by a structural distortion from the tetragonal I4/m to monoclinic P112 1/a phase with a √2×√2×1 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 provides a... Mehr ...
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Dokumenttyp: | Artikel |
Erscheinungsdatum: | 2011 |
Verlag/Hrsg.: |
American Physical Society (APS)
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Schlagwörter: | CRIII IONS / ELECTRONIC STRUCTURE CALCULATIONS / FERROMAGNETIC STATE / FULLY SPIN-POLARIZED / HOLLANDITES / PEIERLS / PEIERLS INSTABILITY / PEIERLS TRANSITION / QUASI-ONE-DIMENSIONAL / RUNNING-IN / STRUCTURAL DISTORTIONS / SUPER CELL / SYNCHROTRON X RAY DIFFRACTION / TETRAMERS / CHROMIUM / ELECTRONIC STRUCTURE / FERROMAGNETIC MATERIALS / FERROMAGNETISM / METAL INSULATOR BOUNDARIES / OLIGOMERS / SEMICONDUCTOR INSULATOR BOUNDARIES / X RAY DIFFRACTION / METAL INSULATOR TRANSITION |
Sprache: | Englisch |
Permalink: | https://search.fid-benelux.de/Record/base-27504219 |
Datenquelle: | BASE; Originalkatalog |
Powered By: | BASE |
Link(s) : | http://elar.urfu.ru/handle/10995/111527 |
Synchrotron x-ray diffraction experiment shows that the metal-insulator transition occurring in a ferromagnetic state of a hollandite K 2Cr 8O 16 is accompanied by a structural distortion from the tetragonal I4/m to monoclinic P112 1/a phase with a √2×√2×1 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 provides a rare example of the Peierls transition of fully spin-polarized electron systems. © 2011 American Physical Society. ; Japan Society for the Promotion of Science, JSPS: 19052004, 21224008, 22244041, 22540363.