Interfacial electron-hole coexistence and ultrathin superconductivity in La2CuO4/LaSrCuO4 bilayers

Chuanyu Shi; Lele Ju; Yanzhi Wang; Meng Zhang; Jirong Sun; Yanwu Xie

doi:10.1103/3lq2-m6p9

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Interfacial electron-hole coexistence and ultrathin superconductivity in La2CuO4/LaSrCuO4 bilayers

Chuanyu Shi, Lele Ju, Yanzhi Wang, Meng Zhang, Jirong Sun, Yanwu Xie

DOI 10.1103/3lq2-m6p9 · Physical Review B

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Abstract

We present a comprehensive transport study of interface superconductivity in La2CuO4/LaSrCuO4 [LCO/LSCO(1.0)] bilayers, where both constituent layers are insulating in bulk. Our experiments reveal that superconductivity is localized within the LCO layer, with holes exhibiting a decaying distribution that extends up to 5 unit cells, reaching optimal superconductivity at the third CuO2 plane. Furthermore, Hall effect measurements indicate a mobile electron layer in LSCO(1.0), suggesting a unique coexistence of electrons and holes at the interface. Superconductivity persists in bilayers with total thickness as thin as 1.5 unit cells. These results provide insights into charge-carrier dynamics at cuprate interfaces and demonstrate robust interfacial superconductivity down to the ultrathin limit.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	onset
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23	Pressure not reported	zero_resistance