Superconducting ReBa2Cu3O7-8,9 ultrathin films and superlattices

Qi Li; Chuhe Kwon; Santanu Bhattacharya; Chris Doughty; S.-N. Mao; L. Senapathi; Xiaoxing Xi; T. Venkatesan; J. L. Peng; Z. Li; Richard L. Greene; Kyunmgin Ham; R. Sooryakumar; Steven A. Schwarz

doi:10.1117/12.179156

29 June 1994 Superconducting ReBa₂Cu₃O_7-δ ultrathin films and superlattices

Qi Li, Chuhe Kwon, Santanu Bhattacharya, Chris Doughty, S.-N. Mao, L. Senapathi, Xiaoxing Xi, T. Venkatesan, J. L. Peng, Z. Li, Richard L. Greene, Kyunmgin Ham, R. Sooryakumar, Steven A. Schwarz

Author Affiliations +

Proceedings Volume 2157, Superconducting Superlattices and Multilayers; (1994) https://doi.org/10.1117/12.179156
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Ultrathin ReBa₂Cu₃O_7-(delta ) (ReBCO) (Re equals Y, Nd) films in the form of trilayer sandwiches between (Pr_xY_1-x)Ba₂Cu₃O_{7- (delta} )((Pr_xY_1-x)BCO) (1 >= x >= 0) and YBCO/(Pr_xY_1-x)BCO superlattices with nominal YBCO layer thickness as thin as 1 unit- cell were grown by pulsed laser deposition. It was found that although the 1-unit-cell thick YBCO films were superconducting, the T_c value depends strongly on the doping level x in the adjacent layers. The T_c value increases when x is reduced. A number of effects, either extrinsic or intrinsic in origin, have been examined by various experiments. The results indicate that the lattice mismatch, interdiffusion between Y and Pr atoms, and oxygen deficiency are unlikely to be the primary reason. Charge redistribution and the possibility of K-T transition were suggested by Raman and transport measurement, but the effects observed may not be sufficient to explain the change of zero resistance temperature and the broadening of the transition in these sample structures.

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Qi Li, Chuhe Kwon, Santanu Bhattacharya, Chris Doughty, S.-N. Mao, L. Senapathi, Xiaoxing Xi, T. Venkatesan, J. L. Peng, Z. Li, Richard L. Greene, Kyunmgin Ham, R. Sooryakumar, and Steven A. Schwarz "Superconducting ReBa₂Cu₃O_7-δ ultrathin films and superlattices", Proc. SPIE 2157, Superconducting Superlattices and Multilayers, (29 June 1994); https://doi.org/10.1117/12.179156

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