Chapter

Relevant lengths

Richard A Klemm

in Layered Superconductors

Published in print December 2011 | ISBN: 9780199593316
Published online May 2012 | e-ISBN: 9780191738128 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199593316.003.0005

Series: International Series of Monographs on Physics

Relevant lengths

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The chapter, Relevant Lengths, describes the five phenomenological lengths important for layered superconductors. A fundamental length is the c-axis unit cell edge s, or the repeat distance normal to the layers. When the magnetic field is normal to the layers, it penetrates into the superconductor with penetration depth λ(T), but when the field is parallel to the layers, it penetrates with penetration depth λ(T) in the direction perpendicular to the layers, but with the longer λ(T) in the direction perpendicular to the magnetic field but which is also parallel to the layers. The coherence lengths ξ T and ξ T) describe the range of the fluctuations parallel and normal to the layers and characterize the size of the vortex cores, depending upon the field direction. Dimensional crossover occurs when ξ T) is comparable to s.

Keywords: repeat distance; layered; superconductors; coherence lengths; penetration depths; dimensional crossover; fluctuations; vortex cores

Chapter.  2971 words.  Illustrated.

Subjects: Condensed Matter Physics

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