Superconductivity of one-unit-cell thick YBa2Cu3O7 thin film

T. Terashima; K. Shimura; Y. Bando; Y. Matsuda; A. Fujiyama; S. Komiyama

doi:10.1103/PhysRevLett.67.1362

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Superconductivity of one-unit-cell thick YBa2Cu3O7 thin film

T. Terashima, K. Shimura, Y. Bando, Y. Matsuda, A. Fujiyama, S. Komiyama

DOI 10.1103/PhysRevLett.67.1362 · Physical Review Letters

T1

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Abstract

We have found for the first time that superconductivity can occur in a one-unit-cell-thick layer of YBa2Cu3O7 (YBCO). The layer is grown, while monitoring with RHEED oscillations, on a superconducting PrBa2Cu3O7 (PrBCO) buffer layer and covered by a PrBCO layer by reactive evaporation. A reduction of the onset temperature is found to be mainly due to a decrease of the hole carriers but not due to the absence of interlayer couplings. This covering PrBCO layer has been found to provide the YBCO layer with carrier holes sufficient to induce superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	onset
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown