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Cubitt R, Levett S, Bud'ko SL, et al. Experimental evidence for anisotropic double-gap behavior in MgB2. Phys Rev Lett. 2003;90(15):157002doi: 10.1103/PhysRevLett.90.157002.
Cubitt, R., Levett, S., Bud'ko, S. L., Anderson, N. E., & Canfield, P. C. (2003). Experimental evidence for anisotropic double-gap behavior in MgB2. Physical review letters, 90(15), 157002. https://doi.org/10.1103/PhysRevLett.90.157002
Cubitt, R, et al. "Experimental evidence for anisotropic double-gap behavior in MgB2." Physical review letters vol. 90,15 (2003): 157002. doi: https://doi.org/10.1103/PhysRevLett.90.157002
Cubitt R, Levett S, Bud'ko SL, Anderson NE, Canfield PC. Experimental evidence for anisotropic double-gap behavior in MgB2. Phys Rev Lett. 2003 Apr 18;90(15):157002. doi: 10.1103/PhysRevLett.90.157002. Epub 2003 Apr 17. PMID: 12732063.
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Phys Rev Lett. 2003 Apr 18;90(15):157002. doi: 10.1103/PhysRevLett.90.157002. Epub 2003 Apr 17.

Experimental evidence for anisotropic double-gap behavior in MgB2.

Physical review letters

R Cubitt, S Levett, S L Bud'ko, N E Anderson, P C Canfield

Affiliations

  1. Institut Laue Langevin, Grenoble, France.

PMID: 12732063 DOI: 10.1103/PhysRevLett.90.157002

Abstract

The behavior of a type II superconductor in the presence of a magnetic field is governed by two characteristic length scales, the London penetration depth and the coherence length. We present magnetization measurements on MgB2 powder showing an anisotropy in the upper critical field and hence the coherence length of 6. Using the technique of small angle neutron scattering we show that this anisotropy is not mirrored in the London penetration depth, which is almost isotropic. This result can be explained by the superconductivity residing in two distinct electronic bands of the material, only one of which is highly anisotropic.

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