Far Infrared Magneto-Conductivity Tensor of Superconducting YBa_2Cu_3O7 thin films
Abstract
We have performed magneto-transmission measurements on YBa_2Cu_3O7 thin films from microwave to infrared frequencies at low temperatures from which we extracted the full frequency dependent conductivity tensor of the system by a Kramers-Kronig analysis (H.-T. S. Lihn et al)., Preprint Library, cond-mat (9510045).. The resulting conductivity reveals two finite frequency chiral oscillators in addition to the zero frequency oscillator of finite width which has been well established from microwave studies of type II superconductors, and which arises from the damped motion of pinned massless vortices. The chiral features have been identified as the vortex pinning resonance (24 cm-1) and the vortex core resonance (60 cm-1) in comparison with a clean limit theory by Hsu (T. C. Hsu, Physica C 213, 305 (1993); E.-J. Choi et al)., Phys. Rev. B 49, 13271 (1994).. We will discuss a composite vortex model, in which the massless vortex currents move relative to the massive vortex core, that successfully describes the response.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1996
- Bibcode:
- 1996APS..MAR.K1111L