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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/1292

Title: In-situ growth of superconducting YBa2Cu3O7 - δ thin films at low oxygen partial pressures
Authors: Chaudhary, Sujeet
Singh, Kanwal Jeet
Pandya, Dinesh K
Kashyap, Subhash C
Keywords: Atomic force microscopy
Sputtering
Superconductivity
Surface morphology
Issue Date: 1997
Citation: Thin Solid Films, 303(1-2), 128-135
Abstract: In-situ superconducting c-axis oriented YBa2Cu3O7 - δ (YBCO) thin films have been grown at Tsub = 775 °C on SrTiO3(100) and MgO(100) by r.f.-magnetron sputtering at an oxygen partial pressure, which not only lies below the stability line but is more than an order of magnitude lower than its empirically suggested limit. The effect of variation in partial pressure of oxygen (Po2) on the film characteristics is analyzed by employing a.c.-magnetic susceptibility, resistance-temperature variation, Rutherford backscattering, atomic force microscopy (AFM), scanning electron microscopy and X-ray diffraction techniques. The oxygen deficiency, δ, is calculated employing a number of techniques. The higher c-axis lattice parameters of the films are supportive of antisite disorder in the cations. The AFM investigations have established that Stranski-Krastanov-type growth mechanism is operative in the present case. The variation in critical current density (Jmagc(T)) with temperature is reported for the first time in the low pressure sputtered films exhibiting a Jmagc(43 K) of ≈4.6 × 106 A cm-2.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/1292
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