High-pressure studies of superconductivity in BiO$_{0.75}$F$_{0.25}$BiS$_2$

Bulletin of Materials Science

关键词: Superconductivity;    crystal structure;    resistivity;    high pressure magnetism.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

BiO$_{0.75}$F$_{0.25}$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 BiO$_{0.75}$F$_{0.25}$BiS$_2$. The Tc in our sample is 5.3 K, at ambient pressure, which is marginal but definite enhancementover $T_c$ reported earlier ($=$5.1 K). The upper critical field Hc2(0) is greater than 3 T, which is higher than earlier report onthis material. As determined from the M–H curve, both H$_{c2}$ and H$_{c1}$ decrease under external pressure $P$ ($0 \leq P \leq 1$ GPa). We observe a decrease in critical current density and transition temperature on applying pressure in BiO$_{0.75}$F$_{0.25}$BiS$_2$.

【 授权许可】

CC BY