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Evidence for Superconductivity in SrTa2S5and Metallic Characteristics of SrNb2S5

✍ Scribed by Norihito Kijima; Masatomo Takahashi; Nobuhiro Matsumoto; Shoichi Nagata

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 240 KB
Volume: 135
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1997.7628

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✦ Synopsis

A strontium niobium sulfide, SrNb 2 S 5 , and a strontium tantalum sulfide, SrTa 2 S 5 , have been successfully synthesized by a sulfurization method using CS 2 . SrNb 2 S 5 and SrTa 2 S 5 have hexagonal structures with lattice constants of a ‫؍‬ 3.361, c ‫؍‬ 24.06 A s and a ‫؍‬ 3.306, c ‫؍‬ 24.26 A s , respectively. SrNb 2 S 5 shows metallic conductivity and temperature-independent susceptibility with an extremely small Curie-Weiss contribution at low temperatures. SrTa 2 S 5 exhibits a superconducting transition at 2.75 K (midpoint). The superconducting transition temperature of SrTa 2 S 5 depends on the purity of specimens. We have verified that the high-purity specimen shows the superconducting transition with a much lower T c than that of low-purity specimen.

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