Pressure effect in the antiperovskite phosphide superconductor Sr(Pt0.9Pd0.1)3P

Lifen Shi; Pengtao Yang; Teng Wang; Pengfei Shan; Ziyi Liu; Shuxiang Xu; Keyu Chen; Ningning Wang; Long Zhou; Youwen Long; Jianping Sun; Gang Mu; Yoshiya Uwatoko; Bosen Wang; Jinguang Cheng

doi:10.1103/PhysRevB.105.214529

Pressure effect in the antiperovskite phosphide superconductor Sr(Pt0.9Pd0.1)3P

Lifen Shi, Pengtao Yang, Teng Wang, Pengfei Shan, Ziyi Liu, Shuxiang Xu, Keyu Chen, Ningning Wang, Long Zhou, Youwen Long, Jianping Sun, Gang Mu, Yoshiya Uwatoko, Bosen Wang, Jinguang Cheng

DOI 10.1103/PhysRevB.105.214529 · Physical Review B

T1

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Abstract

We report a high-pressure study on the antiperovskite phosphide superconductor Sr(Pt0.9Pd0.1)3P. The superconducting transition temperature Tc decreases with a negative differential pressure coefficient, dlnTc/dP≈–0.052GPa–1 (dTc/dP≈–0.33K/GPa for P<10GPa), which is a very high value for antiperovskite superconductors. We find that the upper critical field μ0Hc2(0) also decreases with increasing pressure, but the μ0Hc2(0)/kBTc, e.g., 2Δ0[πN(EF)]1/2/kBTc, is doubled from ∼0.5–0.7 T/K at ambient pressure to ∼1.2 T/K at 31.7 GPa. Our comparative studies on the dependences of Tc as functions of physical pressure versus chemical doping support that Sr(Pt0.9Pd0.1)3P belongs to a phonon-mediated Bardeen-Cooper-Schrieffer-type superconductor with enhanced superconducting coupling strengths. The reduction of Tc with pressure should mainly originate from the decrease of the density of states at the Fermi level and the phonon-hardening effect. Our results shed some light on understanding the superconducting mechanisms of Pt-based antiperovskite superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr(Pt0.9Pd0.1)3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.1	Pressure unresolved	onset
Sr(Pt0.9Pd0.1)3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure unresolved	zero_resistance
Sr(Pt0.9Pd0.1)3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.1	Pressure unresolved	onset
SrPt3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.4	Pressure not reported	unknown
CaPt3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.6	Pressure not reported	unknown
LaPt3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.5	Pressure not reported	unknown
MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown
CuNNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.2	Pressure not reported	unknown
SnSr3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5	Pressure not reported	unknown