2017年4月
Soft phonon modes in the vicinity of the structural quantum critical point
PHYSICAL REVIEW B
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- 巻
- 95
- 号
- 15
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.95.155142
- 出版者・発行元
- AMER PHYSICAL SOC
The quasiskutterudite superconductors A(3)T(4)Sn(13) 9A = 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(omega) and the electron-phonon transport coupling function alpha F-2(tr)(omega) 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.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.95.155142
- ISSN : 2469-9950
- eISSN : 2469-9969
- Web of Science ID : WOS:000400136500001