Abstract
The out-of-plane magnetoresistance in optimally doped (T/sub c/ approximately=90 K) and oxygen-deficient (T/sub c/ approximately=58 K) thin films of YBa/sub 2/Cu/sub 3/O/sub 7- delta / grown on vicinal SrTiO/sub 3/ substrates was investigated. The magnetoresistance of both compounds changes sign above the critical temperature. The results are compared to theoretical predictions for the magnetic-field suppression, of superconducting order parameter fluctuations in anisotropic materials. It is suggested that the competition of Aslamazov-Larkin and density-of-states fluctuations, which contribute with different sign to the magnetoresistance, are responsible for the observed sign change.
| Original language | English |
|---|---|
| Pages (from-to) | 1265-1269 |
| Number of pages | 5 |
| Journal | Journal of Low Temperature Physics |
| Volume | 117 |
| Issue number | 5-6 |
| DOIs | |
| Publication status | Published - 1999 |
Austrian Fields of Science 2012
- 103018 Materials physics
Keywords
- barium-compounds; electronic-density-of-states; fluctuations-in-superconductors; high-temperature-superconductors; magnetoresistance-; superconducting-thin-films; superconducting-transition-temperature; yttrium-compounds sign-change; out-of-plane-magnetoresistance; optimally-doped-superconducting-thin-films; O-deficient-superconducting-thin-films; YBa-sub-2-Cu-sub-3-O-sub-7-delta-; SrTiO-sub-3-substrates; magnetoresistance-; critical-temperature; magnetic-field-suppression; superconducting-order-parameter-fluctuations; anisotropic-materials; Aslamazov-Larkin-fluctuations; density-of-states-fluctuations; 90-K; 58-K; SrTiO-sub-3-; YBa-sub-2-Cu-sub-3-O-sub-7- A7430F-Transport-properties-of-superconductors; A7470V-Perovskite-phase-superconductors; A7475-Superconducting-films; A7430J-Electronic-structure-of-superconductors; A7440-Fluctuations-and-critical-effects-in-superconductors; A7410-Superconducting-critical-temperature,-occurrence; A7430C-Magnetic-properties-of-superconductors