Structural Phase Transition in the Spin Gap System YbAl<SUB>3</SUB>C<SUB>3</SUB>

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  • Matsumura Takeshi
    Department of Quantum Matter, ADSM, Hiroshima University Department of Physics, Graduate School of Science, Tohoku University
  • Inami Toshiya
    Synchrotron Radiation Research Unit, Japan Atomic Energy Agency
  • Kosaka Masashi
    Graduate School of Science and Engineering, Saitama University
  • Kato Yoshiaki
    Graduate School of Science and Engineering, Saitama University
  • Inukai Takaki
    Department of Physics, Graduate School of Science, Tohoku University
  • Ochiai Akira
    Department of Physics, Graduate School of Science, Tohoku University
  • Nakao Hironori
    Department of Physics, Graduate School of Science, Tohoku University
  • Murakami Youichi
    Department of Physics, Graduate School of Science, Tohoku University
  • Katano Susumu
    Graduate School of Science and Engineering, Saitama University
  • Suzuki Hiroyuki S.
    National Institute for Materials Science

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  • Structural phase transition in the spin gap system YbAl3C3

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The unresolved phase transition at 80 K in YbAl3C3 has been studied by X-ray diffraction. It has been confirmed that the transition is a structural one with atomic displacement. Superlattice reflections that appear below 80 K show that the crystal structure changes from hexagonal to orthorhombic. From the reflection conditions, we conclude that the space group in the low temperature phase is Pbca, where all the atoms occupy the general 8c site. By fitting the observed intensities, we present two possible models of atomic displacement. The displacement results in the deformation of the triangular lattice of Yb spins, which is considered to be responsible for the formation of a spin-singlet ground state at low temperatures.

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