Strong Coupling Superconductivity in the Vicinity of the Structural Quantum Critical Point in (CaxSr1−x)3Rh4Sn13
Wing Chi Yu, Yiu Wing Cheung, Paul J. Saines, Masaki Imai, Takuya Matsumoto, Chishiro Michioka, Kazuyoshi Yoshimura, Swee K. Goh
DOI 10.1103/PhysRevLett.115.207003 · Physical Review Letters
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Abstract
The family of the superconducting quasiskutterudites (CaxSr1−x)3Rh4Sn13 features a structural quantum critical point at xc=0.9, around which a dome-shaped variation of the superconducting transition temperature Tc is found. Using specific heat, we probe the normal and the superconducting states of the entire series straddling the quantum critical point. Our analysis indicates a significant lowering of the effective Debye temperature on approaching xc, which we interpret as a result of phonon softening accompanying the structural instability. Furthermore, a remarkably large enhancement of 2Δ/kBTc and ΔC/γTc beyond the Bardeen-Cooper-Schrieffer values is found in the vicinity of the structural quantum critical point. The phase diagram of (CaxSr1−x)3Rh4Sn13 thus provides a model system to study the interplay between structural quantum criticality and strong electron-phonon coupling superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr3Rh4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.2 | Pressure unresolved | midpoint |
| Ca3Rh4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure unresolved | midpoint |
| (CaxSr1-x)3Rh4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | midpoint |
| Sr3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ca3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 1.8 GPa | unknown |
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