Site-selective mott transition in a quasi-one-dimensional vanadate V6O13

The microscopic mechanism of the metal-insulator transition is studied by orbital-resolved ^{51}V NMR spectroscopy in a prototype of the quasi-one-dimensional system V6O13. We uncover that the transition involves a site-selective d orbital order lifting twofold orbital degeneracy in one of the two V...

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Bibliographic Details
Published in:Physical review letters 2015-04, Vol.114 (16), p.166403-166403
Main Authors: Shimizu, Yasuhiro, Aoyama, Satoshi, Jinno, Takaaki, Itoh, Masayuki, Ueda, Yutaka
Format: Article
Language:English
Subjects:
Antiferromagnetism
Ground state
Hoisting
Metal-insulator transition
NMR spectroscopy
Orbitals
Vanadates
Vanadium oxides
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Summary:The microscopic mechanism of the metal-insulator transition is studied by orbital-resolved ^{51}V NMR spectroscopy in a prototype of the quasi-one-dimensional system V6O13. We uncover that the transition involves a site-selective d orbital order lifting twofold orbital degeneracy in one of the two VO6 chains. The other chain leaves paramagnetic moments on the singly occupied d(xy) orbital across the transition. The two chains respectively stabilize an orbital-assisted spin-Peierls state and an antiferromagnetic long-range order in the ground state. The site-selective Mott transition may be a source of the anomalous metal and the Mott-Peierls duality.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.114.166403