High-pressure effects in anti-post-perovskite superconductors V3PnNx (Pn = P, As)

B. S. Wang; J.-G. Cheng; K. Matsubayashi; Y. Uwatoko; K. Ohgushi

doi:10.1103/PhysRevB.89.144510

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High-pressure effects in anti-post-perovskite superconductors V3PnNx (Pn = P, As)

B. S. Wang, J.-G. Cheng, K. Matsubayashi, Y. Uwatoko, K. Ohgushi

DOI 10.1103/PhysRevB.89.144510 · Physical Review B

T1

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Abstract

Pressure effects on the superconductors V3PnNx (Pn = P and As) with the two-dimensional anti-post-perovskite structure were investigated. It was found that with increasing pressure, the superconducting transition temperature (Tc) decreases with a negative differential pressure (P) coefficient dTc/dP = −0.19 and −0.013 K/GPa for Pn = P and As, respectively. This is in marked contrast to the positive differential pressure coefficients reported for other vanadium-based superconductors with a three-dimensional crystal structure. The observed change in Tc under pressure is revealed to be closely correlated with the evolution of the normal-state resistivity. The results support the phonon-mediated superconductivity in V3PnNx.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
V3PN0.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5	Pressure unresolved	zero_resistance
V3PN0.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.7	8 GPa	zero_resistance
V3AsN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.46	Pressure unresolved	zero_resistance
V3AsN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.21	8 GPa	zero_resistance
V3PN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.2	Pressure not reported	unknown
V3AsN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.6	Pressure not reported	unknown
V3P0.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.6	Pressure not reported	unknown