Second-order structural transition in the superconductor La3Co4Sn13

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Y. W. Cheung
  • J. Z. Zhang
  • J. Y. Zhu
  • Y. J. Hu
  • D. G. Wang
  • Yuka Otomo
  • Kazuaki Iwasa
  • Koji Kaneko
  • Masaki Imai
  • Hibiki Kanagawa
  • Kazuyoshi Yoshimura
  • Swee K. Goh

Detail(s)

Original languageEnglish
Article number241112
Journal / PublicationPhysical Review B
Volume93
Issue number24
Publication statusPublished - 15 Jun 2016
Externally publishedYes

Abstract

The quasiskutterudite superconductor La3Co4Sn13 undergoes a phase transition at T=152 K. By measuring the temperature dependence of heat capacity, electrical resistivity, and the superlattice reflection intensity using x rays, we explore the character of the phase transition at T. Our lattice dynamic calculations found imaginary phonon frequencies around the M point when the high-temperature structure is used in the calculations, indicating that the structure is unstable at the zero-temperature limit. The combined experimental and computational results establish that T is associated with a second-order structural transition with q = (0.5,0.5,0) (or the M point). Further electronic band structure calculations reveal Fermi surface sheets with low-curvature segments, which allow us to draw qualitative comparison with both Sr3Ir4Sn13 and Sr3Rh4Sn13 in which similar physics has been discussed recently.

Citation Format(s)

Second-order structural transition in the superconductor La3Co4Sn13. / Cheung, Y. W.; Zhang, J. Z.; Zhu, J. Y.; Yu, W. C.; Hu, Y. J.; Wang, D. G.; Otomo, Yuka; Iwasa, Kazuaki; Kaneko, Koji; Imai, Masaki; Kanagawa, Hibiki; Yoshimura, Kazuyoshi; Goh, Swee K.

In: Physical Review B, Vol. 93, No. 24, 241112, 15.06.2016.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review