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Tuning superconductivity by carrier injection

Source: Appl. Phys. Lett. 96, 082507 (2010); doi:10.1063/1.3327825

Published 24 February 2010

KEYWORDS and PACS
Keywords
PACS
  • 74.62.Dh
    Effects of crystal defects, doping and substitution on superconducting transition temperature
  • 74.25.fc
    Electric and thermal conductivity
  • 74.50.+r
    Superconductor tunneling phenomena; point contacts, weak links, Josephson effects
  • 74.72.-h
    Cuprate superconductors
  • 74.25.Sv
    Critical currents in superconductors
  • YEAR: 2010
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PUBLICATION DATA
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Yuri Koval,1 Xiaoyue Jin,1 Christoph Bergmann,1 Yilmaz Simsek,1 Lütfi Özyüzer,1 Paul Müller,1 Huabing Wang,2 Günter Behr,3 and Bernd Büchner3
1Department of Physics, Universität Erlangen-Nürnberg, Erwin-Rommel-Straße 1, 91058 Erlangen, Germany
2National Institute for Materials Science, Tsukuba 3050047, Japan
3Institute for Solid State Research, IFW-Dresden, P.O. Box 270116, 01171 Dresden, Germany
We have found that by extensive current injection along the c-axis, the superconducting properties of Bi2Sr2CaCu2O8+delta can be changed effectively. We show that critical temperature, c-axis resistivity, and critical current of intrinsic Josephson junctions can be tuned in a large range from underdoping to extreme overdoping. This effect is reversible and persistent. Our results can be explained by trapping charges in the insulating layers, which induce a change of carrier concentration in superconducting planes. This floating gate concept can be a general property of layered materials where the insulating charge reservoir layers are separated from the conducting planes. ©2010 American Institute of Physics
History: Received 10 December 2009; accepted 31 January 2010; published 24 February 2010
Permalink: http://link.aip.org/link/?APPLAB/96/082507/1

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