Second-order structural transition in the superconductor La3Co4Sn13

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

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19 Citations (Scopus)

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.

Original languageEnglish
Article number241112
JournalPhysical Review B
Volume93
Issue number24
DOIs
Publication statusPublished - 2016 Jun 21

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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