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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