Pressure-induced Superconductivity in Tellurium Single Crystal
arxiv(2023)
摘要
Tellurium (Te) is one of the p-orbital chalcogens, which shows attractive
physical properties at ambient pressure. Here, we systematically investigate
both structural and electronic evolution of Te single crystal under high
pressure up to 40 GPa. The pressure dependence of the experimental Raman
spectrum reveals the occurrence of multiple phase transitions, which is
consistent with highpressure synchrotron X-ray diffraction (XRD) measurements.
The appearance of superconductivity in high-pressure phase of Te is accompanied
by structural phase transitions. The high-pressure phases of Te reveal a
nonmonotonic evolution of superconducting temperature Tc with notably different
upper critical fields. The theoretical calculations demonstrate that the
pressure dependence of the density of states(DOS) agrees well with the
variation of Tc. Our results provide a systematic phase diagram for the
pressure-induced superconductivity of Te.
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