Soft phonon modes in the vicinity of the structural quantum critical point

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

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Author(s)

  • Y. J. Hu
  • Y. W. Cheung
  • Masaki Imai
  • Hibiki Kanagawa
  • Joichi Murakawa
  • Kazuyoshi Yoshimura
  • Swee K. Goh

Detail(s)

Original languageEnglish
Article number155142
Journal / PublicationPhysical Review B
Volume95
Issue number15
Publication statusPublished - 15 Apr 2017
Externally publishedYes

Abstract

The quasiskutterudite superconductors A3T4Sn13 (A=Sr, Ca; T=Ir, Rh, Co) are highly tunable, featuring a structural quantum critical point. We construct a temperature-lattice constant phase diagram for these isovalent compounds, establishing Ca3Rh4Sn13 and Ca3Co4Sn13 as members close to and far away from the structural quantum critical point, respectively. Deconvolution of the lattice specific heat and the electrical resistivity provide an approximate phonon density of states F(ω) and the electron-phonon transport coupling function αtr2F(ω) for Ca3Rh4Sn13 and Ca3Co4Sn13, enabling us to investigate the influence of the structural quantum critical point. Our results support the scenario of phonon softening close to the structural quantum critical point, and explain the enhancement of the coupling strength on approaching structural instability.

Citation Format(s)

Soft phonon modes in the vicinity of the structural quantum critical point. / Hu, Y. J.; Cheung, Y. W.; Yu, W. C.; Imai, Masaki; Kanagawa, Hibiki; Murakawa, Joichi; Yoshimura, Kazuyoshi; Goh, Swee K.

In: Physical Review B, Vol. 95, No. 15, 155142, 15.04.2017.

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