Pressure-induced Quantum Phase Transition in Cr1-xVx Alloys

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  • Oomi G.
    Department of Physics, Kyushu University
  • Fuchizaki Y.
    Department of Physics, Kyushu University
  • Ohashi M.
    Faculty of Environmental Design, Kanazawa University
  • Nakano T.
    Department of Materials Science and Technology, Faculty of Engineering, Niigata University
  • Uwatoko Y.
    Institute of Solid State Physics, Tokyo University

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Abstract

  The electrical resistivities and Hall effect of Cr1-xVx alloys(x<0.04) were measured at high pressure. The Néel temperature TN of x = 0.015, 0.032 and 0.035 was found to disappear at corresponding Pc of 5.6 GPa, 1.1 GPa and 0.7 GPa, respectively. The Hall coefficients of x = 0.032 and 0.035 demonstrated a discontinuous change around Pc, which implies a quantum phase transition induced by high pressure. We found that the exponents in the power law of resistivity of x = 0.015 had an anomaly around Pc, which means that the large quantum fluctuations affect the resistivity even at high temperature. A possibility of superconductivity is explored near Pc for x = 0.032. A slight decrease in the ρ(T) curve was observed below 1 K at high pressure. The origins for that are briefly discussed.

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