Difference between Al and C doping in anisotropic upper critical field development inMgB2

2004/10/28 by M. Angst, Manuel Angst, S. L. Bud’ko +4 · 1 citation
Materials Science · Physics and Astronomy · #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #Thermal Expansion and Ionic Conductivity #cond-mat.mtrl-sci #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.71.144512

published as Phys. Rev. B 71, 144512 (2005) · 6 pages, 4 figures

arxiv created 2004/10/28 · openalex publication_date 2005/04/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The temperature dependence of the upper critical field H_c2 for both field directions in partially substituted polycrystalline MgB₂ was determined. Whereas the suppression of T_c is similar for aluminum and carbon substituted samples, H_c2 is affected by the substitution in profoundly different ways. In the case of Al substitution changes can tentatively be described by intrinsic effects (shift of the Fermi level). In the C substituted samples, H_c2 is increased drastically, and extrinsic effects (disorder) have to play a major role. The strong contrast between the two substitutions is discussed, taking into account three relevant scattering rates.

Citations

• Determination of the Fermi Surface ofMgB2by the de Haas–van Alphen Effect
• Superconductivity inMgB2: Clean or Dirty?
• Two-band/two-gap superconductivity in carbon-substitutedMgB2evidenced by point-contact spectroscopy
• Systematic study of two-band/two-gap superconductivity in carbon-substitutedMgB2by point-contact spectroscopy
• Carbon substitution inMgB2single crystals: Structural and superconducting properties
• Anisotropy and internal-field distribution ofMgB2in the mixed state at low temperatures
• Carbon-substituted MgB2 single crystals

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• MgB2single crystals substituted with Li and with Li-C: Structural and superconducting properties