1. Influence of strong disorder on superconductivity of MgB2 thin films
- Author
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Koch, Th., Zdravkov, Vladimir I., Surdu, A., Condrea, E., Socrovisciuc, A., Rossolenko, A. N., Ryazanov, V. V., Straumal, B., Tidecks, Reinhard, Wixforth, Achim, and Sidorenko, Anatoli S.
- Subjects
TK7800-8360 ,Physics ,QC1-999 ,Electronics - Abstract
We investigated the influence of disorder on superconductivity of MgB2 films, prepared in a single deposition run onto two different substrates: (100)-MgO and on (128° rot)-LiNbO3 with trigonal crystal structure which does not match to the MgB2 structure. As expected, the microstructure of both films crucially differs. The REM study shows a very homogeneous, smooth morphology of the MgB2 film on MgO, but a very rough inhomogeneous film structure on LiNbO3. Although the MgB2 film on LiNbO3 is strongly disordered, its critical temperature Tc=33.5 K is practically the same as for the film deposited on MgO. Possible reasons of such unusual Tc behavior are discussed.
- Published
- 2008