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Observational analysis reveals two maxima of critical temperature in the superconductor, suggesting diverse phases under pressure.
We have measured electrical resistivity and X-ray diffraction under high-pressure on the BiS 2 -based superconductor Eu 2 SrBi 2 S 2 Se 2 F 4 , using cubic anvil cell and diamond anvil cell, respectively. The superconducting transition temperature ( T c ) exhibited a double dome behavior with two maxima at 1.5 GPa ( T c = 2.62 K) and 5 GPa ( T c = 2.61 K). The pressure dependence of T c indicates the presence of multiple of superconducting phases. Pressure-induced superconducting phases occur with structural phase transitions.
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Ishigaki et al. (2025) studied this question.
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