Pressure-Induced Phase Transition in La$_{1-x}$Sm$_{x}$O$_{0.5}$F$_{0.5}$BiS$_2$

Y. Fang; D. Yazici; B. D. White; M. B. Maple

doi:10.1103/PhysRevB.92.094507

paper

Pressure-Induced Phase Transition in La $_{1 - x}$ Sm $_{x}$ O $_{0.5}$ F $_{0.5}$ BiS $_{2}$

arXiv:1507.03172 · doi:10.1103/PhysRevB.92.094507

Abstract

Electrical resistivity measurements on La $_{1 - x}$ Sm $_{x}$ O $_{0.5}$ F $_{0.5}$ BiS $_{2}$ ( $x$ = 0.1, 0.3, 0.6, 0.8) have been performed under applied pressures up to 2.6 GPa from 2 K to room temperature. The superconducting transition temperature $T$ $_{c}$ of each sample significantly increases at a Sm-concentration dependent pressure $P$ $_{t}$ , indicating a pressure-induced phase transition from a low- $T$ $_{c}$ to a high- $T$ $_{c}$ phase. The compounds that have higher Sm concentrations have higher $T$ $_{c}$ values at ambient pressure; however, the $T$ $_{c}$ values at $P$ $>$ $P$ $_{t}$ decrease with $x$ and $P$ $_{t}$ shifts to higher pressures with Sm substitution. In the normal state, semiconducting-like behavior is suppressed and metallic conduction is induced with increasing pressure in all of the samples. These results suggest that the pressure dependence of $T$ $_{c}$ for the BiS $_{2}$ -based superconductors is related to the lattice parameters at ambient pressure and enable us to estimate the evolution of $T$ $_{c}$ for SmO $_{0.5}$ F $_{0.5}$ BiS $_{2}$ under pressure.

Pressure-Induced Phase Transition in La $_{1 - x}$ Sm $_{x}$ O $_{0.5}$ F $_{0.5}$ BiS $_{2}$

Abstract

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Pressure-Induced Phase Transition in La1−x​Smx​O0.5​F0.5​BiS2​

Abstract

References in corpus (14)

Cited by in corpus (9)

Pressure-Induced Phase Transition in La $_{1 - x}$ Sm $_{x}$ O $_{0.5}$ F $_{0.5}$ BiS $_{2}$