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Tsuchida, Shun*; Hirose, Yusuke*; Sekikawa, Takuya; Ono, Yoshiaki*; Settai, Rikio*

The excitonic insulators have the property that the entire crystal becomes an insulator due to the collective behavior of electrons and holes bound together in the crystal, and they have begun to attract attention as a new physical property. In this study, we focused on TaNiSe, which is one of the excitonic insulator candidates, but its synthesis itself is difficult and its physical properties have not yet been clarified. As a result, superconductivity was observed in (TaM)NiSe at x = 0.08 in the high pressure region. The superconducting transition temperature was found to increase with increasing pressure. The phase transition shown in this study may provide new insight into the relationship between exciton insulators and superconductivity.