Eliashberg theory for disordered superconductors. II. Tunneling into disordered two-dimensional Pb films |
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Authors: | Thorsten Höhn Bo?idar Mitrovi? |
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Institution: | (1) Institut für Physik der Universität Augsburg, Memminger Strasse 6, D-86135 Augsburg, Germany |
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Abstract: | A series ofc-axis oriented YBa2Cu3O
x
-films with different oxygen content were prepared by laser deposition. The oxygen contentx was determined by X-ray diffraction and by resonant Rutherford-back-scattering (RRBS) measurements. Thec-axis length in these films of YBa2Cu3O
x
is about 0.5% larger compared to bulk values. We describe transport measurements in magnetic fields up to 7 Tesla between room temperature andT
c
in samples with an oxygen content between the orthorhombic-to-tetragonal transition (x 6.4) and full oxygenation (x 7). The ratio /R
H
was investigated with respect to the two-dimensional Luttinger liquid theory and the model of the two-dimensional ionic metal . We report on deviations from the expected quadratic temperature behaviour of /R
H
, especially in films with high oxygen content. |
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Keywords: | 74 76 Bz 74 25 Fy 73 50 Jt |
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