In situ epitaxial growth of superconducting La-based bilayer cuprate thin films

I. Tsukada; Y. Nagao; Yoichi Ando

doi:10.1103/PhysRevB.69.020504

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In situ epitaxial growth of superconducting La-based bilayer cuprate thin films

I. Tsukada, Y. Nagao, Yoichi Ando

DOI 10.1103/PhysRevB.69.020504 · Physical Review B

T1

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Abstract

We investigate the epitaxial growth of bilayer cuprate La2CaCu2O6+δ using pure ozone as an oxidant, and find that even the crystal with parent composition without cation substitution can show metallic behavior with the aid of epitaxial-strain effect. The hole concentration is controlled simply by excess-oxygen doping, and the films grown under the optimum conditions exhibit superconductivity below 30 K. This is the first result on the superconductivity of bilayer La2CaCu2O6+δ induced purely by the excess oxygen.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	onset
La2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	onset
La2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5	Pressure not reported	zero_resistance
La2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	45	Pressure not reported	onset