Novel approach for the analysis of the fluctuation magnetoconductivity in YBa2Cu3O7 thin films

Autor(en)

C. Sekirnjak, W. Lang, S. Proyer, P. Schwab

Abstrakt

We report measurements of the paraconductivity and of the fluctuation magnetoconductivity as a function of both the magnetic field up to 13 T and the temperature in thin epitaxial films of YBa2Cu3O7. An analysis within the model for dirty-limit superconductors yields consistent values for the in-plane, the out-of-plane coherence lengths, and the quasiparticle phase coherence time. Although an estimation of the mean free carrier path indicates that YBa2Cu3O7 is a clean superconductor, the appropriate clean-limit theory produces an unrealisticly short phase coherence time, around half the value of the transport scattering time, and fails to fit the paraconductivity data. We show that if the magnetoconductivity due to the orbital motion of the normal-state quasiparticles is taken into account, the Maki-Thompson fluctuation contribution at high temperatures is significantly smaller than predicted by both clean- and dirty-limit theories. This result suggests non-s-wave pairing in YBa2Cu3O7.

Organisation(en)

Elektronische Materialeigenschaften

Journal

Physica C: Superconductivity and its Applications

Band

243

Seiten

60-68

Anzahl der Seiten

9

ISSN

0921-4534

DOI

https://doi.org/10.1016/0921-4534(94)02454-5

Publikationsdatum

1995

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/3e5cad0c-ccbc-4fc4-a0ae-4cb2a2c6bab9