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Anomalous metallic state in the vicinity of Metal to Valence Bond Solid insulator transition in LiVS2

Authors :
Katayama, N.
Uchida, M.
Hashizume, D.
Niitaka, S.
Matsuno, J.
Matsumura, D.
Nishihata, Y.
Mizuki, J.
Takeshita, N.
Gauzzi, A.
Nohara, M.
Takagi, H.
Publication Year :
2009

Abstract

We investigate LiVS2 and LiVSe2 with a triangular lattice as itinerant analogues of LiVO2, known for the formation of valence bond solid (VBS) state out of S = 1 frustrated magnet. LiVS2, which is located at the border between a metal and a correlated insulator, shows a first ordered transition from a paramagnetic metal to a VBS insulator at Tc ~ 305 K upon cooling. The presence of VBS state in the close vicinity of insulator-metal transition may suggest the importance of itinerancy in the formation of VBS state. We argue that the high temperature metallic phase of LiVS2 has a pseudo-gap, likely originating from the VBS fluctuation. LiVSe2 was found to be a paramagnetic metal down to 2 K.<br />Comment: 4 pages, 4 figures

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.0908.1244
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevLett.103.146405