|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Electrical anisotropy in high-Tc granular superconductors in a magnetic field | | D. Daghero
; P. Mazzetti
; A. Stepanescu
; P. Tura
; A. Masoero
; | | Date: |
29 Oct 2002 | | Journal: | Phys. Rev. B 66, 184514 (2002) | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | We propose an analytical model devoted to explain the anisotropy of the electrical resistance observed below the critical temperature in granular high-Tc superconductors submitted to a magnetic field H. Reported experimental results obtained on a YBCO sample show that the superconducting transition occurs in two stages, with a steep drop of the resistance at Tc and a subsequent, smoother decrease. In this second stage, the resistance vs. temperature curve is strongly dependent not only on the field intensity, but also on the angle between H and the macroscopic current density j. We start from the assumption that the resistance below Tc is mainly due to the weak links between grains. In the model, weak links are thought of as flat surface elements separating adjacent grains. We calculate the probability for a weak link to undergo the transition to the resistive state, as a function of the angles it makes with the external magnetic field H and the macroscopic current density j. In doing this, an important role is given to the strong non-uniformity of the local magnetic field within the specimen, due to the effect of the screening supercurrents flowing on the surface of the grains. Finally, we calculate the electrical resistance of the sample in the two cases where H is parallel and perpendicular to j, respectively. The predictions of this simple model turn out to be in reasonable agreement with reported experimental results obtained on a YBCO granular specimen. | | Source: | arXiv, cond-mat/0210648 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER