Second-order structural transition in the superconductor La3Co4Sn13
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AbstractThe 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.
All Author(s) ListCheung YW, Zhang JZ, Zhu JY, Yu WC, Hu YJ, Wang DG, Otomo Y, Iwasa K, Kaneko K, Imai M, Kanagawa H, Yoshimura K, Goh SK
Journal namePhysical Review B
Volume Number93
Issue Number24
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesPhysics; Physics, Condensed Matter

Last updated on 2020-20-11 at 02:02