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The newly discovered BiS$_2$-based LaO$_{1-x}$F$_{x}$BiS$_2$ ($x$=0.5)becomes superconductive at $T_c$=2.5 K. Electrical resistivity andmagnetization measurements are performed under pressure to determine thepressure dependence of the superconducting transition temperature $T_c$. Weobserve that $T_c$ abruptly increases from 2.5 K to 10.7 K at a pressure of 0.7GPa. According to high-pressure X-ray diffraction measurements, a structuralphase transition from a tetragonal phase ($P$4/$nmm$) to a monoclinic phase($P$2$_1/m$) also occurs at around $\sim$ 1 GPa. We consider that apressure-induced enhancement of superconductivity is caused by the structuralphase transition.

Pressure-induced Enhancement of Superconductivity in BiS$_2$-layered LaO$_{1-x}$F$_x$BiS$_2$