Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2

Dahm T, Schopohl N (2003)
Physical Review Letters 91(1): 17001.

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DOI
Autor*in
Dahm, ThomasUniBi; Schopohl, N
Einrichtung
Fakultät für Physik > AG Theorie der Kondensierten Materie
Abstract / Bemerkung
Recent measurements of the anisotropy of the upper critical field B-c2 on MgB2 single crystals have shown a puzzling strong temperature dependence. Here, we present a calculation of the upper critical field based on a detailed modeling of band structure calculations that takes into account both the unusual Fermi surface topology and the two gap nature of the superconducting order parameter. Our results show that the strong temperature dependence of the B-c2 anisotropy can be understood as an interplay of the dominating gap on the sigma band, which possesses a small c-axis component of the Fermi velocity, with the induced superconductivity on the pi-band possessing a large c-axis component of the Fermi velocity. We provide analytic formulas for the anisotropy ratio at T=0 and T=T-c and quantitatively predict the distortion of the vortex lattice based on our calculations.
Erscheinungsjahr
2003
Zeitschriftentitel
Physical Review Letters
Band
91
Ausgabe
1
Art.-Nr.
17001
ISSN
0031-9007
eISSN
1079-7114
Page URI
https://pub.uni-bielefeld.de/record/2330191

Zitieren

Dahm T, Schopohl N. Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2. Physical Review Letters. 2003;91(1): 17001.
Dahm, T., & Schopohl, N. (2003). Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2. Physical Review Letters, 91(1), 17001. https://doi.org/10.1103/PhysRevLett.91.017001
Dahm, Thomas, and Schopohl, N. 2003. “Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2”. Physical Review Letters 91 (1): 17001.
Dahm, T., and Schopohl, N. (2003). Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2. Physical Review Letters 91:17001.
Dahm, T., & Schopohl, N., 2003. Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2. Physical Review Letters, 91(1): 17001.
T. Dahm and N. Schopohl, “Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2”, Physical Review Letters, vol. 91, 2003, : 17001.
Dahm, T., Schopohl, N.: Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2. Physical Review Letters. 91, : 17001 (2003).
Dahm, Thomas, and Schopohl, N. “Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2”. Physical Review Letters 91.1 (2003): 17001.

7 Zitationen in Europe PMC

Daten bereitgestellt von Europe PubMed Central.

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PMID: 14995332
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Koshelev AE, Golubov AA., Phys Rev Lett 92(10), 2004
PMID: 15089235

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