Abstract
The pressure dependences of the electrical resistance and the superconducting transition temperature, Tc, in Se and Te have been measured up to 57 GPa and 42 GPa, respectively. A semiconductor- metal transition of Se and Te, which occured at 23 GPa and 4 GPa, respectively, corresponded to the structural transition to monoclinic phase. The pressure dependence of Tc of Se showed an anomaly at about 36 GPa, corresponding to a structural transition from monoclinic to orthorhombic phase. The Tc of monoclinic-Se was 5.6 K at 26 GPa and independent of pressure. The Tc of Te exhibited a significant enhancement at 35 GPa, which resulted from the structural transition from β-Po type to bcc phase, and reached a maximum value of 7.4 K.
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