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Since the discoveries of high-temperature superconductivity in cupratesuperconductors, the attempts to understand their superconducting mechanism andsearch for new high-temperature superconducting families have never been pausedin over three decades. Recently, the signatures of superconductivity near 80 Khave been discovered in the single crystal of La3Ni2O7 under pressure, whichmakes it a new candidate of the high-temperature superconductors dominated by3d transition elements after the cuprate and iron-pnictide superconductors, andhas attracted significant attention. However, the superconductivity,characterized by the zero resistance and the Meissner effect, is anomalouslyirreproducible in La3Ni2O7. In this study, we report the experimental resultsobtained from highly sensitive ac susceptibility measurements, which revealthat the maximum superconducting volume fraction in the La3Ni2O7 sample isapproximately 1%. In tandem with the observation of the zero-resistance stateonly in some of the samples, we suggest that the superconductivity in thisnickelate is filamentary-like. Furthermore, from the high-pressure Hallcoefficient (RH) measurements, we find that RH remains positive under pressureup to 28.8 GPa but displays a significant change in RH(P) at the criticalpressure of about 10 GPa, where the superconductivity emerges, highlighting thecrucial role of hole-carrier enhancement in boosting the superconductivity inLa3Ni2O7. Our results provide new insights into understanding the puzzlingquestions of the high-Tc superconductivity emerging from this complex systemand a clue for exploring new high-Tc superconducting materials in 3d transitionmetal compounds.

Evidence of filamentary superconductivity in pressurized La3Ni2O7 single crystals