Interrelation of the critical magnetic field H c2 and the residual resistivity for the two-band superconductor MgB2

Autor:	N. P. Shabanova, Aleksander I. Golovashkin
Rok vydání:	2009
Předmět:	Superconductivity Materials science Solid-state physics Condensed matter physics Relaxation (NMR) chemistry.chemical_element Electron Condensed Matter Physics Electronic Optical and Magnetic Materials Residual resistivity chemistry Electronic band structure Boron Carbon
Zdroj:	Physics of the Solid State. 51:670-677
ISSN:	1090-6460 1063-7834
Popis:	An expression that describes the upper critical magnetic field Hc2 and generalizes the Gor’kov relation has been derived for the two-band two-gap superconductor MgB2. The expression relates the upper critical magnetic field Hc2 to the residual resistivity and the parameters of the band structure and holds in the range from the clean limit to the dirty limit. The ratios of the relaxation times τπ/τσ and the mean free paths of π- and σ-band electrons for MgB2 samples with a low defect level and Mg(B1 − xCx)2 samples with a partial substitution of carbon for boron are determined from experimental data.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::96b27464e822c28e78299191701596cb https://doi.org/10.1134/s1063783409040039 Zobrazit plný text záznamu Full text from SpringerLink