Bulk superconductivity and Pauli paramagnetism in nearly stoichiometric CuCo2S4

Yu-Ying Jin; Shi-Huai Sun; Yan-Wei Cui; Qin-Qing Zhu; Liang-Wen Ji; Zhi Ren; Guang-Han Cao

doi:10.1103/PhysRevMaterials.5.074804

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Bulk superconductivity and Pauli paramagnetism in nearly stoichiometric CuCo2S4

Yu-Ying Jin, Shi-Huai Sun, Yan-Wei Cui, Qin-Qing Zhu, Liang-Wen Ji, Zhi Ren, Guang-Han Cao

DOI 10.1103/PhysRevMaterials.5.074804 · Physical Review Materials

T1

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Abstract

It has long remained elusive whether CuCo2S4 thiospinel shows bulk superconductivity (SC). Here we clarify the issue by studying the samples of sulfur-deficient CuCo2S3.7 and sulfurized CuCo2S4. The sample CuCo2S3.7 has a smaller lattice constant of a=9.454 Å, and it is not superconducting down to 1.8 K. After a full sulfurization, the a axis of the thiospinel phase increases to 9.475 Å, and the thiospinel becomes nearly stoichiometric CuCo2S4, although a secondary phase of slightly Cu-doped CoS2 forms. Bulk SC at 4.2 K and Pauli paramagnetism have been demonstrated for the sulfurized CuCo2S4 by the measurements of electrical resistivity, magnetic susceptibility, and specific heat.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CuCo2S3.7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CuCo2S4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.2	Pressure not reported	onset
CuCo2S4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.3	Pressure not reported	onset
NaxCoO2·yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.5	Pressure not reported	unknown
Cu1.5Co1.5S4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4	Pressure not reported	onset
Cu1.5Co1.5S4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure not reported	zero_resistance
Cu1.3K0.2Co1.5S4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.4	Pressure not reported	unknown