Anisotropic Superconductivity in Epitaxial MgB2 Films

Abstract

High-quality epitaxial MgB2 thin films prepared by pulsed laser deposition with Tc = 39 K offer the opportunity to study the anisotropy and robustness of the superconducting state in magnetic fields. We measure the in-plane electrical resistivity of the films in magnetic fields to 60T and estimate the superconducting upper critical field Hc(0) = 24 +- 3 T for field oriented along the c-axis, and Hab(0) = 30 +- 2 T for field in the plane of the film. We find the zero-temperature coherence lengths xi_c(0) = 30 A and xi_ab(0) = 37 A to be shorter than the calculated electronic mean free path l = 100 +- 50 A, which places our films in the clean limit. The observation of such large upper critical fields from clean limit samples, coupled with the relatively small anisotropy, provides strong evidence of the viability of MgB2 as a technologically important superconductor.

arXiv comment11 pages, including 4 figures. Chem. Phys. Lett., in press

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• Growth of c-oriented MgB2 thin films by Pulsed Laser Deposition: structural characterization and electronic anisotropy
• Anisotropy parameters of superconducting MgB${}_2$
• The Dendritic magnetic avalanches in carbon-free MgB${}_2$ thin films with and without a deposited Au layer
• Strong Coupling and Double Gap Density of States in Superconducting MgB2
• Growth methods of c-axis oriented MgB2 thin films by pulsed laser deposition
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• Magnetoresistivity in MgB2 as a probe of disorder in p- and s-bands
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• Systematic characterization of upper critical fields for MgB${}_2$ thin films using the two-band superconducting theory
• Complicated nature of the gap in MgB2: magnetic field-dependent optical studies
• Anisotropy in c-oriented MgB2 thin films grown by Pulsed Laser Deposition
• Effect of the four-sheet Fermi surface on magnetoresistivity of MgB2
• Upper critical magnetic field and multiband superconductivity in artificial high-Tc superlattices of nano quantum wells
• Magnetic anisotropy of thin sputtered MgB2 films on MgO substrates in high magnetic fields
• High magnetic field response of superconductivity dome in quantum artificial High Tc superlattices with variable geometry