High-pressure studies of superconductivity in $$\hbox {BiO}_{0.75}\hbox {F}_{0.25}\hbox {BiS}_{2}$$ |
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| Authors: | Zeba Haque Gohil S Thakur Ganesan Kalai Selvan Sonachalam Arumugam L C Gupta A K Ganguli |
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| Affiliation: | 1.Department of Chemistry,Indian Institute of Technology Delhi,New Delhi,India;2.Centre for High Pressure Research, School of Physics,Bharathidasan University,Tiruchirappalli,India;3.Institute of Nano Science and Technology, Habitat Centre,Mohali,India;4.Solid State and Nano Research Laboratory,Department of Chemistry, IIT Delhi,New Delhi,India;5. Max Planck Institute for Chemical Physics of Solids,Dresden,Germany |
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| Abstract: | \(\hbox {BiO}_{0.75}\hbox {F}_{0.25}\hbox {BiS}_{2}\) crystallizes in tetragonal CeOBiS\(_{2}\) structure (S. G. P4/nmm). We have investigated the effect of pressure on magnetization measurements. Our studies suggest improved superconducting properties in polycrystalline samples of \(\hbox {BiO}_{0.75}\hbox {F}_{0.25}\hbox {BiS}_{2}\). The \(T_{\mathrm{c}}\) in our sample is 5.3 K, at ambient pressure, which is marginal but definite enhancement over \(T_{\mathrm{c}}\) reported earlier (= 5.1 K). The upper critical field \(H_{\mathrm{c}2}\)(0) is greater than 3 T, which is higher than earlier report on this material. As determined from the M–H curve, both \(H_{\mathrm{c}2}\) and \(H_{\mathrm{c}1}\) decrease under external pressure P (0 \(\le P \le \) 1 GPa). We observe a decrease in critical current density and transition temperature on applying pressure in \(\hbox {BiO}_{0.75}\hbox {F}_{0.25}\hbox {BiS}_{2}\). |
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