Pressure Induced Quantum Critical Point and Non-Fermi-Liquid Behavior in BaVS3

Abstract

The phase diagram of BaVS3 is studied under pressure using resistivity measurements. The temperature of the metal to nonmagnetic Mott insulator transition decreases under pressure, and vanishes at the quantum critical point p_cr=20kbar. We find two kinds of anomalous conducting states. The high-pressure metallic phase is a non-Fermi liquid described by Delta rho = T^n where n=1.2-1.3 at 1K < T < 60K. At p<p_cr, the transition is preceded by a wide precursor region with critically increasing resistivity which we ascribe to the opening of a soft Coulomb gap.

4 pages, 5 eps figures, problem with figure corrected

References in corpus (4)

• Interplay of disorder and spin fluctuations in the resistivity near a quantum critical point
• Destruction of the Mott Insulating Ground State of Ca_2RuO_4 by a Structural Transition
• Orbitally Driven Spin Pairing in the 3D Non-Magnetic Mott Insulator BaVS3: Evidence from Single Crystal Studies
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Cited by in corpus (17)

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• Experimental Electronic Structure and Interband Nesting in BaVS_3
• Quantum transport equations for low-dimensional multiband electronic systems. I
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• Partial quantum statistics and its implications for narrow band materials