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Title: Structural origin of enhanced critical temperature in ultrafine multilayers of cuprate superconducting films

Authors:
; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1160037
Report Number(s):
BNL-106116-2014-JA
R&D Project: MA509MACA; MA015MACA; KC0203020; KC0201010
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: PHYSICAL REVIEW B; Journal Volume: 89; Journal Issue: 18
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zheng F., Logvenov G., Bozovic, I., Zhu, Y., and He, J. Structural origin of enhanced critical temperature in ultrafine multilayers of cuprate superconducting films. United States: N. p., 2014. Web. doi:10.1103/PhysRevB.89.184509.
Zheng F., Logvenov G., Bozovic, I., Zhu, Y., & He, J. Structural origin of enhanced critical temperature in ultrafine multilayers of cuprate superconducting films. United States. doi:10.1103/PhysRevB.89.184509.
Zheng F., Logvenov G., Bozovic, I., Zhu, Y., and He, J. Fri . "Structural origin of enhanced critical temperature in ultrafine multilayers of cuprate superconducting films". United States. doi:10.1103/PhysRevB.89.184509.
@article{osti_1160037,
title = {Structural origin of enhanced critical temperature in ultrafine multilayers of cuprate superconducting films},
author = {Zheng F. and Logvenov G. and Bozovic, I. and Zhu, Y. and He, J.},
abstractNote = {},
doi = {10.1103/PhysRevB.89.184509},
journal = {PHYSICAL REVIEW B},
number = 18,
volume = 89,
place = {United States},
year = {Fri May 16 00:00:00 EDT 2014},
month = {Fri May 16 00:00:00 EDT 2014}
}
  • Proximity-effect theory of superconductor--normal-metal (S/N) superlattices is extended to the case of multilayers with an interphase between S and N layers. A nonmonotonic dependence of the superlattice critical temperature on the period ..lambda.. is obtained theoretically, in accordance with experiments of Qian et al. on Nb/Ti. Similar behavior of the perpendicular upper critical field H/sub c//sub 2/ is predicted.
  • We have studied superconducting and magnetic properties of sputtered Fe/Nb/Fe trilayers. For a fixed Nb thickness and with changing Fe thickness, {ital d}{sub Fe}, a nonmonotonic behavior of the superconducting transition temperature {ital T}{sub {ital c}} was observed with a maximum at {ital d}{sub Fe}{approx_equal}10 A. The analysis of the magnetization data revealed that for {ital d}{sub Fe}{le}7 A the Fe layer is nonmagnetic. The interpretation of the observed {ital T}{sub {ital c}} behavior is attributed to the existence of this magnetically {open_quote}{open_quote}dead{close_quote}{close_quote} layer and the change of the interaction of the Cooper pairs with this layer at the onsetmore » of ferromagnetism for {ital d}{sub Fe}{ge}7 A. {copyright} {ital 1996 The American Physical Society.}« less
  • The structure of vortices within an infinite stack of thin superconducting layers is considered and examined in detail in the limit of zero interlayer Josephson coupling. The basic building block for the description of three-dimensional (3D) vortex lines is shown to be the 2D pancake vortex, which is a vortex located in only one of the layers; the other layers contain no vortices, but have an important effect in screening the magnetic field generated by currents in the first layer. It is shown that 3D vortex lines can be built up by superposing the contributions of stacks of 2D pancakemore » vortices. Thermal excitation is shown to break up a single 3D vortex line at a temperature corresponding to the Kosterlitz-Thouless temperature of a single superconducting layer. The effect of thermally induced decoupling of the 2D vortex solids in different layers, corresponding to melting only in the direction perpendicular to the layers, is also considered. It is shown that Josephson coupling can be neglected in the high-temperature superconductors only under very stringent conditions. Although these conditions evidently are not met in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} and Tl{sub 2}Ba{sub 2}Ca{sub 1}Cu{sub 2}O{sub 8}, they should be satisfied in superconducting-insulating multilayer systems, such as YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}/PrBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}.« less