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The importance of electron-hole interband interactions is widely acknowledgedfor iron-pnictide superconductors with high transition temperatures (Tc).However, high-Tc superconductivity without hole carriers has been suggested inFeSe single-layer films and intercalated iron-selenides, raising a fundamentalquestion whether iron pnictides and chalcogenides have different pairingmechanisms. Here, we study the properties of electronic structure in thehigh-Tc phase induced by pressure in bulk FeSe from magneto-transportmeasurements and first-principles calculations. With increasing pressure, thelow-Tc superconducting phase transforms into high-Tc phase, where we find thenormal-state Hall resistivity changes sign from negative to positive,demonstrating dominant hole carriers in striking contrast to other FeSe-derivedhigh-Tc systems. Moreover, the Hall coefficient is remarkably enlarged and themagnetoresistance exhibits anomalous scaling behaviors, evidencing stronglyenhanced interband spin fluctuations in the high-Tc phase. These results inFeSe highlight similarities with high-Tc phases of iron pnictides, constitutinga step toward a unified understanding of iron-based superconductivity.

High-Tc superconductivity in FeSe at high pressure: Dominant hole carriers and enhanced spin fluctuations