Phonon anomaly and anisotropic superconducting gap in noncentrosymmetric Li2(Pd1−xPtx)3B

G. Eguchi; D. C. Peets; M. Kriener; S. Yonezawa; G. Bao; S. Harada; Y. Inada; G.-q. Zheng; Y. Maeno

doi:10.1103/PhysRevB.87.161203

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Phonon anomaly and anisotropic superconducting gap in noncentrosymmetric Li2(Pd1−xPtx)3B

G. Eguchi, D. C. Peets, M. Kriener, S. Yonezawa, G. Bao, S. Harada, Y. Inada, G.-q. Zheng, Y. Maeno

DOI 10.1103/PhysRevB.87.161203 · Physical Review B

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Abstract

We report the systematic investigation of the specific heat of the noncentrosymmetric superconductor Li2(Pd1−xPtx)3B as a function of x. There is a large deviation of the phononic specific heat from the conventional Debye specific heat for Pt-rich samples. In contrast with the fully gapped conventional behavior for small x, a power-law temperature dependence of the electronic specific heat is observed even at x=0.5. These results manifest a strongly anisotropic or nodal superconducting gap even at x=0.5 and a nodal superconducting gap for x≳0.9.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Li2(Pd1-xPtx)3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Li2Pd3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Li2Pt3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown