Kosterlitz-Thouless Transition in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8+δ$ Thin Films

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dc.creatorString, Vortex
dc.creatorOta, Tomoko
dc.creatorTsukada, Ichiro
dc.creatorTerasaki, Ichiro
dc.creatorUchinokura, Kunimitsu
dc.date1994-05-10
dc.date1994-05-12
dc.date.accessioned2026-07-07T08:58:50Z
dc.date.available2026-07-07T08:58:50Z
dc.descriptionCurrent-voltage ($I-V$) characteristics and the increase of superconducting transition temperature $T_c$ as a function of the number of half-unit-cell layers $n$ are studied on Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+δ}$ 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. Using experimental data obtained with Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+δ}$ 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 $T_c$ and $n$. These results indicate that the interlayer interaction plays an important role in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+δ}$ thin films.
dc.description27 pages and 10 figures (uuencoded postscript files) appended, RevTeX 3.0 (Minor corrections are made concerning citations.)
dc.identifierhttps://arxiv.org/abs/cond-mat/9405027
dc.identifierhttp://arxiv.org/abs/cond-mat/9405027
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/147482
dc.subjectCondensed Matter
dc.titleKosterlitz-Thouless Transition in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8+δ$ Thin Films
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