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Phys. Rev. B 81, 184514 (2010) [6 pages]

Meissner response of a bulk superconductor with an embedded sheet of reduced penetration depth

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John R. Kirtley1,2,3, Beena Kalisky1,2, Lan Luan1,4, and Kathryn A. Moler1,2,4
1Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305-4045, USA
2Department of Applied Physics, Stanford University, Stanford, California 94305-4045, USA
3IBM Watson Research Center, Route 134, Yorktown Heights, New York 10598, USA
4Department of Physics, Stanford University, Stanford, California 94305-4045, USA

See Also: Publisher's Note

Received 16 December 2009; published 17 May 2010; publisher error corrected 16 June 2010

See accompanying Physics Viewpoint

We calculate the change in susceptibility resulting from a thin sheet with reduced penetration depth embedded perpendicular to the surface of an isotropic superconductor, in a geometry applicable to scanning superconducting quantum interference device microscopy, by numerically solving Maxwell’s and London’s equations using the finite-element method. The predicted stripes in susceptibility agree well in shape with the observations of Kalisky et al. Phys. Rev. B 81 184513 (2010) of enhanced susceptibility above twin planes in the underdoped pnictide superconductor Ba(Fe1−xCox)2As2. By comparing the predicted stripe amplitudes with experiment and using the London relation between penetration depth and superfluid density, we estimate the enhanced Cooper-pair density on the twin planes, and the barrier force for a vortex to cross a twin plane. Fits to the observed temperature dependence of the stripe amplitude suggest that the twin planes have a higher critical temperature than the bulk, although stripes are not observed above the bulk critical temperature.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.81.184514
DOI:
10.1103/PhysRevB.81.184514
PACS:
74.62.Dh, 74.25.Ha, 74.70.Dd, 74.62.Bf

See Also

See Also: B. Kalisky, J. R. Kirtley, J. G. Analytis, Jiun-Haw Chu, A. Vailionis, I. R. Fisher, and K. A. Moler, Stripes of increased diamagnetic susceptibility in underdoped superconducting Ba(Fe1−xCox)2As2 single crystals: Evidence for an enhanced superfluid density at twin boundaries, Phys. Rev. B 81, 184513 (2010).

Publisher's Note: John R. Kirtley, Beena Kalisky, Lan Luan, and Kathryn A. Moler, Publisher's Note: Meissner response of a bulk superconductor with an embedded sheet of reduced penetration depth [Phys. Rev. B 81, 184514 (2010)], Phys. Rev. B 81, 229905 (2010).

 
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