Second-order structural transition in the superconductor La3Co4Sn13
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Article number | 241112 |
Journal / Publication | Physical Review B |
Volume | 93 |
Issue number | 24 |
Publication status | Published - 15 Jun 2016 |
Externally published | Yes |
Link(s)
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 journal › peer-review