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Superconducting properties of magnetron sputtered high Tc thin films containing oxide compounds of yttrium, bismuth, or thallium

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3 Author(s)
Kang, J.H. ; Argonne Nat. Lab., IL, USA ; Kampwirth, R.T. ; Gray, K.E.

The authors have used multiple-source magnetron sputtering to prepare thin films of Y-Ba-Cu-O, Bi-Ca-Sr-Cu-O, and Tl-Ca-Ba-Cu-O on (100) SrTiO3, (100) MgO, and ZrO2-9%Y2O 3 substrates. Y-Ba-Cu-O films grow best on SrTiO3 with mostly an a-axis orientation. Stoichiometry, particularly the Ba/Cu ratio, must be within 2% of the correct value to obtain narrow Δ Tc transitions. Conversely, the 80 K phase of Bi-Ca-Sr-Cu-O films grows best on MgO substrates and has a predominant c-axis orientation. The requirements on composition are less stringent; however, the annealing temperature must be held within a narrow range around 865°C to obtain the best films. The best films of Tl-Ca-Ba-Cu-O compounds are grown on (100) oriented and polycrystalline ZrO2 substrates. The highest zero-resistance transition temperature is about 114 K in the Tl2Ba2Ca2 Cu3Ox phase and 100-105 K in Tl2Ba2Ca1Cu2Ox and Tl1Ba2Ca2Cu3Ox phase samples. The upper critical-field measurements show high anisotropies in the critical-field slopes. A comparison is made among preparation conditions and superconducting properties, including T c, ΔTc, and dBc2 /dT (parallel and perpendicular to film surface) of all three compounds

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Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 2 )