Laser deposition of CdS/Y-Ba-Cu-O heterostructures

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Abstract
Pulsed laser deposition was used to grow high‐quality Y‐Ba‐Cu‐O (YBCO) and CdS thin films sequentially on MgO. A temperature window between 200 and 250 °C was found to be suitable for the deposition of CdS on YBCO. The transition temperature of the heterostructure was measured to be 72 K while the single YBCO film had a Tc of 85 K. The degradation was determined to be due to interface reaction, rather than the result of poor deposition conditions. X‐ray measurements indicated that the CdS film was hexagonal and c‐axis oriented. In situ resistivity measurement was used to monitor the film growth dynamics.