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Kosterlitz-Thouless Transitions in Bi 2 Sr 2 CaCu 2 O 8 + δ Thin Films by Vortex String
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ota, Tomoko Tsukada, Ichiro Terasaki, Ichiro Uchinokura, Kunimitsu |
| Copyright Year | 1994 |
| Abstract | Current-voltage (I − V ) characteristics and the increase of superconducting transition temperature Tc as a function of the number of half-unit-cell layers n are studied on Bi2Sr2CaCu2O8+δ thin films grown by molecular beam epitaxy. These observations are interpreted in terms of Kosterlitz-Thouless (KT) transition associated with vortex string threading the film. Considering the change in the types of the lowest free-energy excitations as a function of the size of vortex pair, we have formulated KT renormalization-group (RG) equations. They are with respect to independent vortex and antivortex pairs with distance r less than n-dependent characteristic length rn and then in terms of vortex-string and antivortex-string pairs with r > rn. RG equations of these two regions are connected by the continuity of superconducting carrier density and vortex density per area. Using experimental data obtained with Bi2Sr2CaCu2O8+δ thin films, we have solved the RG equations. It is shown that the KT transition occurs in the vortex-string region with interstring ln r interaction only. Our calculation successfully explains KT scaling in I − V characteristics and the relation between Tc and n. These results indicate that the interlayer interaction plays an important role in Bi2Sr2CaCu2O8+δ thin |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/cond-mat/9405027v2.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
