Studies on Fabrication of Ag/HgBaCaCuO/CdSe Heterostructures by Pulse-Electrodeposition Route

Metal/superconductor/semiconductor (Ag/HgBaCaCuO/CdSe) heterostructures have been successfully fabricated using pulse-electrodeposition technique. The electrochemical parameters are optimized and diffusion free growth of CdSe onto Ag/HgBaCaCuO was obtained by employing under-potential deposition and by studying nucleation and growth mechanism during deposition. The heterostructures are characterized by X-ray diffraction (XRD), full-width at half-maximum (FWHM), scanning electron microscopy (SEM) studies and low temperature four probe electrical resistivity measurements. After the deposition of CdSe the critical transition temperature of HgBaCaCuO films was found be increased from 115 K with Jc = 1.7 x 103 A/cm2 to 117.2 K with Jc = 1.91 x 103 A/cm2. When the heterostructure was irradiated with red He-Ne laser (2 mW), the Tc was further enhanced to 120.3 K with Jc = 3.7 x 103 A/cm2. This increase in superconducting parameters of HgBaCaCuO in Ag/ HgBaCaCuO/CdSe heterostructure has been explained at length in this paper. Keywords. Electrodeposition; Hg-based cuprate; semiconductor; heterostructures; electrical properties. PACS Nos 81.15.Pq; 74.72.Gr; 78.40.Fy; 84.37; 73.40 *E-mail: [email protected], [email protected]: 22 Pages, 12 Figures. Submitted to Semiconductor Science and Technology. Submitted to Semiconductor Science and Technolog

Thermal fluctuation and 1/f noise in oriented and unoriented Y1Ba2Cu3O7−x films

We report on electrical noise measurements made on YBCO (Y1 Ba2 Cu3 O7−x ) films on SrTiO3, on bulk silicon with a ZrO2 buffer layer, and on thin dielectric membranes. We have found that 1/f noise predominates in the unoriented films and that thermal fluctuation noise is the chief source of noise in good films on SrTiO3 .Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/69764/2/APPLAB-55-21-2233-1.pd