Upper Critical Field Hc2 in Anisotropic Superconductors with Varying Charge Carrier Density: Application of the Theory to Doped MgB2

作者：Palistrant M E^*; Chebotar I D; Ursu V A

来源：Journal of Experimental and Theoretical Physics, 2009, 109(2): 227-236.

DOI：10.1134/S106377610908007X

A theory describing the magnetic properties of a two-band superconductor with a varying charge carrier density is constructed. The upper critical field H-c2((ab)) parallel to the ab plane and field H-c2((c)) parallel to the c axis are determined in the entire temperature range 0 < T < T-c. A considerable increase in upper critical field H-c2((ab)) as compared to H-c2((c)) because of strong anisotropy of the system is detected. Anisotropy of coefficient gamma(H) = H-c2((ab))/H-c2((c)) is obtained as a function of temperature for pure MgB2 and as a function of the chemcical potential in the case when Mg and B atoms are replaced with other chemical elements. A correlation between the variation in the superconduct

• 出版日期2009-8