Soft Phonons and Structural Phase Transitions in La<sub>1.875</sub>Ba<sub>0.125</sub>CuO<sub>4</sub>

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  • Kimura Hiroyuki
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Noda Yukio
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Goka Hideto
    Institute for Chemical Research, Kyoto University
  • Fujita Masaki
    Institute of Material Research, Tohoku University
  • Yamada Kazuyoshi
    Institute of Material Research, Tohoku University
  • Shirane Gen
    Department of Physics, Brookhaven National Laboratory

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  • Soft Phonons and Structural Phase Transitions in La1.875Ba0.125CuO4

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Soft phonon behavior associated with a structural phase transition from the low-temperature-orthorhombic (LTO) phase (Bmab symmetry) to the low-temperature-tetragonal (LTT) phase (P42⁄ncm symmetry) was investigated in La1.875Ba0.125CuO4 using neutron scattering. As temperature decreases, the TO-mode at Z-point softens and approaches to zero energy around Td2=62 K, where the LTO–LTT transition occurs. Below Td2, the phonon hardens quite rapidly and its energy almost saturates below 50 K. At Td2, the energy dispersion of the soft phonon along in-plane direction significantly changes while the dispersion along out-of-plane direction is almost temperature independent. Coexistence between the LTO phase and the LTT phase, seen in both the soft phonon spectra and the peak profiles of Bragg reflection, is discussed in context of the order of structural phase transitions.

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