Abstract
Abstract
We report the effect of hydrostatic pressure on LaO0.5F0.5Bi(S
1
−
x
Se
x
)2 with chemical pressure applied to a conducting layer by means of electrical resistivity and ac-magnetic susceptibility measurements up to 2.5 GPa. We confirmed the bulk superconductive nature of the low superconducting (low-SC) and high superconducting (high-SC) phase using ac-magnetic susceptibility under hydrostatic pressure. The
T
c
of the high-SC phase was observed to decrease with an increase in the Se substitution. The critical pressure
P
c
shifted toward the higher P and the P-induced transition broadened with an increase in the Se content. The
T
c
of the low-SC phase can be expressed by assuming an applied hydrostatic pressure of 0.75 GPa as the Se substitution of x = 0.1. The broad
P
c
transition is likely to be ascribed to the inhomogeneity of the Se substitution.