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http://hdl.handle.net/2074/1292
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| 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... |
| URI: | http://eprint.iitd.ac.in/dspace/handle/2074/1292 |
| Appears in Collections: | Physics
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