Abstract
Using a microcircuit fabricated in a diamond anvil cell, we carried out in situ conductivity measurementson α-HgSand β-HgS under high pressure, and investigated the temperature dependenceof the conductivity of the samples under several pressures. Forα-HgS, the results show that the conductivity increases rapidly with increasing pressure from8 to 20 GPa. The energy gap was obtained by fitting linearly the plot of the logarithm ofconductivity versus the reciprocal of temperature. At 29 GPa, the sample becomes metallic,characterized by a negative temperature slope of conductivity and a zero energy gap. Forβ-HgS, a discontinuity of conductivity was observed at 5 GPa, corresponding to a transition from theβ phaseto the α phase. From 5 to 20 GPa, the conductivity rises rapidly with increasing pressure. At 27 GPa,the sample becomes metallic. In comparison with HgSe and HgTe, we obtainedexperimentally the transition pressure of the two samples from the cinnabar structure tothe rock-salt structure, respectively.
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