Competing role of disorder and charge density wave in superconducting TiSe1.2S0.8
M. Singh, P. Saha, A. Chahar, H. Singh, B. Birajdar, D. K. Shukla, S. Patnaik
DOI 10.1103/vv94-wx44 · Physical Review Materials
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Abstract
Disorder can be utilized as an effective parameter to probe the interplay between two long-range orders such as superconductivity and charge density wave. In the present work, we report the experimental evidence for filamentary superconductivity in polycrystalline TiSe1.2S0.8 with superconducting transition Tc∼7K. This is validated from magnetization and magnetotransport measurements. Strain-induced dislocations, substitution defects, and randomly distributed Ti ions (with local moments) are considered as possible sources of disorder. A detailed analysis of the temperature-dependent resistivity evaluates the degree of disorder and the consequent localization effects. These findings are in contrast to the fact that superconductivity has not been established at ambient pressure in TiSe2−xSx system. It is suggested that disorder serves as a stabilizing factor for the superconducting phase due to incommensuration of the charge density wave.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TiSe1.2S0.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure unresolved | onset |
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