TY - GEN
T1 - Superconducting ReBa2Cu3O7-8,9 ultrathin films and superlattices
AU - Li, Qi
AU - Kwon, C.
AU - Bhattacharya, Santanu
AU - Doughty, C.
AU - Mao, S. N.
AU - Senapathi, L.
AU - Xi, Xiao X.
AU - Venkatesan, T.
AU - Peng, J. L.
AU - Li, Z.
AU - Greene, Richard L.
AU - Ham, K. M.
AU - Sooryakumar, R.
AU - Schwarz, Steven A.
PY - 1994
Y1 - 1994
N2 - Ultrathin ReBa2Cu3O7-δ (ReBCO) (Re = Y, Nd) films in the form of trilayer sandwiches between (PrxY1-x)Ba2Cu3O 7-δ((PrxY1-x)BCO) (1 ≥ x ≥ 0) and YBCO/(Pr xY1-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 Tc value depends strongly on the doping level x in the adjacent layers. The Tc 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.
AB - Ultrathin ReBa2Cu3O7-δ (ReBCO) (Re = Y, Nd) films in the form of trilayer sandwiches between (PrxY1-x)Ba2Cu3O 7-δ((PrxY1-x)BCO) (1 ≥ x ≥ 0) and YBCO/(Pr xY1-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 Tc value depends strongly on the doping level x in the adjacent layers. The Tc 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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M3 - Conference contribution
AN - SCOPUS:0028729465
SN - 0819414522
T3 - Proceedings of SPIE - The International Society for Optical Engineering
SP - 142
EP - 153
BT - Proceedings of SPIE - The International Society for Optical Engineering
A2 - Bozovic, Ivan
PB - Publ by Society of Photo-Optical Instrumentation Engineers
T2 - Superconducting Superlattices and Multilayers
Y2 - 24 January 1994 through 25 January 1994
ER -