Effect of Uniaxial Stress upon the Successive Phase Transitions in K2PbCu(No2)6

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  • Kashida Shoji
    Department of Physics, Faculty of Science, Niigata University

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  • Effect of Uniaxial Stress upon the Successive Phase Transitions in K<SUB>2</SUB>PbCu(NO<SUB>2</SUB>)<SUB>6</SUB>
  • Effect of Uniaxial Stress upon the Succ

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The effect of uniaxial compressive stress upon the successive phase transition temperatures of K2PbCu(NO2)O6 was investigated. The I–II transition temperature (280 K at 1 bar) increased linearly with the rate of 73±2 deg kbar−1 for the [001] stress, 2.5±0.2 deg kbar−1 for the [111] stress and 13.5±1.1 deg kbar−1 for the [110] stress, and the II–III transition temperature (273 K at 1 bar) increased linearly with the rate of 10.4±0.2 deg kbar−1 for the [001] stress, 5.8±0.5 deg kbar−1 for the [111] stress and 7.2±1.3 deg kbar−1 for the [110] stress, respectively. In the case of the compression along the [001] axis, the I–II transition which is of first order at the atmospheric pressure became of second order above around 0.4 kbar. The results are discussed on the basis of an orientational order-disorder model of the Jahn-Teller distorted Cu(NO2)6 octahedra by taking into account a coupling between the orientation of the octahedron and the bulk distortion induced by the pressure.

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