Pressure-driven superconducting dome in the vicinity of CDW in the pyrite-type superconductor CuS2

L. F. Shi; Z. Y. Liu; J. Li; X. X. Zhang; N. N. Wang; Q. Cui; K. Y. Chen; Q. Y. Liu; P. T. Yang; J. P. Sun; B. S. Wang; Y. Uwatoko; Y. Sui; H. X. Yang; J.-G. Cheng

doi:10.1103/PhysRevMaterials.6.014802

Pressure-driven superconducting dome in the vicinity of CDW in the pyrite-type superconductor CuS2

L. F. Shi, Z. Y. Liu, J. Li, X. X. Zhang, N. N. Wang, Q. Cui, K. Y. Chen, Q. Y. Liu, P. T. Yang, J. P. Sun, B. S. Wang, Y. Uwatoko, Y. Sui, H. X. Yang, J.-G. Cheng

DOI 10.1103/PhysRevMaterials.6.014802 · Physical Review Materials

T1

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Abstract

Prior to the superconducting transition at Tc≈1.5K, the pyrite-type CuS2 undergoes a charge-density-wave (CDW) transition at Ts≈150K at ambient pressure. Here we studied the interplay between CDW and superconductivity (SC) in CuS2 by tracking their evolutions with pressure via detailed measurements of resistivity and magnetic susceptibility under hydrostatic pressures up to 6.6 GPa. The high-quality CuS2 samples used in the present study were synthesized under high-pressure and high-temperature conditions, and the formation of the 2×2×2 supercell associated with the commensurate CDW order below Ts was confirmed by low-temperature transmission electron microscope. Our high-pressure results uncover a pressure-driven superconducting dome with an enhanced Tcmax∼2.3K at ∼1.8GPa accompanying the gradual suppression of the CDW order. This work thus demonstrates the competing nature between CDW and SC in the pyrite-type superconductor CuS2.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CuS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.57	Pressure unresolved	onset
CuS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.55	Pressure unresolved	onset
CuS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	1.8 GPa	unknown
CuSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.4	Pressure not reported	unknown
CuTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.3	Pressure not reported	unknown