Published in

American Physical Society, Physical review B, 1(71), 2005

DOI: 10.1103/physrevb.71.012504

Links

Tools

Export citation

Search in Google Scholar

High-field superconductivity in alloyed Mg B 2 thin films

Journal article published in 2005 by J. M. Redwing, X. X. Xi, R. K. Singh, B. Wilkens, J. Rowell, C. Tarantini, V. Braccini, M. Putti, R. Vaglio, A. Gurevich, Je E. Giencke, Mc C. Jewell, Cb B. Eom, Dc C. Larbalestier ORCID, Qi Li and other authors.
This paper is available in a repository.
This paper is available in a repository.

Full text: Download

Green circle
Preprint: archiving allowed
Upload
Green circle
Postprint: archiving allowed
Upload
Green circle
Published version: archiving allowed
Upload
Policy details
Data provided by SHERPA/RoMEO

Abstract

We investigated the effect of alloying on the upper critical field $H_{c2}$ in 12 $MgB_2$ films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant $H_{c2}$ enhancement in C-alloyed films, and an anomalous upward curvature of $H_{c2}(T)$. Record high values of $H_{c2}^{⊥}(4.2) ≃ 35T$ and $H_{c2}\|(4.2) ≃ 51T$ were observed perpendicular and parallel to the ab plane, respectively. The temperature dependence of $H_{c2}(T)$ is described well by a theory of dirty two-gap superconductivity. Extrapolation of the experimental data to T=0 suggests that $H_{c2}\|(0)$ approaches the paramagnetic limit of $∼ 70T$.