Abstract
NdBa 2Cu 3O 7− δ (NdBCO) is known to have the highest T c, among the rare earth REBa 2Cu 3O 7− δ (RBCO) family, and to show higher irreversibility fields than YBa 2Cu 3O 7− δ (YBCO). Recently, excellent superconducting NdBCO films have been synthesized by a laser ablation technique. In this work, the transition temperature, phase and growth morphology of NdBCO films deposited on (100) SrTiO 3 (STO) and (100) MgO substrates by dc sputtering have been investigated. The transition temperature T c is closely related with the c-axis lattice constant and shows a maximum around 1.173 nm. The c-axis lattice constant of the films strongly depends on oxygen pressure P o. High- T c NdBCO films are obtained around P o=350 Pa. The spiral growth morphology of the films is affected by deposition rate and takes place at low deposition rate. The best film has shown a zero resistance transition temperature of 92.6 K.
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