Dynamics vs electronic states of vortex core of high-T_c superconductors investigated by high-frequency impedance measurement

Details Dynamics vs electronic states of vortex core of high-T_c superconductors investigated by high-frequency impedance measurement Dynamics vs electronic states of vortex core of high-T_c superconductors investigated by high-frequency impedance measurement

2001-02-01

arxiv.org/abs/cond-mat/0102022v1

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures, Proceedings of Plasma2000(Sendai), to be published in Physica C

Scientific paper

10.1016/S0921-4534(01)00658-X

Dynamics of vortices reflects the electronic states of quasiparticles in the core. To understand this, we investigated the following three issues. (1) We investigated the complex surface impedance, Zs, of YBa2Cu3Oy as a function of magnetic field, H. The total features were well expressed by the Coffey-Clem model. From the data, we estimated the viscosity and pinning frequency, which were found to be independent of frequency. In particular, the obtained viscosity definitely shows that the core of vortex of YBa2Cu3Oy is moderately clean. This result suggests that new physics will show up, for the physics of quantum moderately clean vortex core is unknown at all. (2) An anomaly found in the surface reactance at the first order transition (FOT) of vortex lattice was investigated in Bi2Sr2CaCu2Oy with various doping levels. As a result, the anomaly was found only in the samples exhibiting the FOT. On the other hand, we did not observe the anomaly in YBa2Cu3Oy. These suggest that the anomaly is due to the change in the electronic states of the vortices characteristic of materials with very strong anisotropy. (3) We measured H dependence of both the thermal conductivity \kappa(H) and Zs(H) in exactly the same pieces of crystal. We could not find any anomaly in Zs(H) even at the onset of the plateau. This result suggests that the origin of the plateau in \kappa(H) is not a drastic phase transition but is rather gradual crossover.

Affiliated with

Also associated with

No associations

Rating

Dynamics vs electronic states of vortex core of high-T_c superconductors investigated by high-frequency impedance measurement does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dynamics vs electronic states of vortex core of high-T_c superconductors investigated by high-frequency impedance measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamics vs electronic states of vortex core of high-T_c superconductors investigated by high-frequency impedance measurement will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-202968