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

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

2009-08-09

arxiv.org/abs/0908.1244v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

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.

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