Abstract The upper critical field of clean MgB2 is investigated using the two-band layered Ginzburg--Landau (GL) theory. The calculated results are fitted to the experimental data of clean MgB2 crystal very well in a broad temperature range. Based on the GL theory for clean superconductors, a phenomenological theory for dirty superconductor is proposed. Selecting appropriate parameters, two-band layered GL theory is successfully applied to the crystal of Mg(B1-xCx)2 and the neutron irradiation samples of MgB2.
Received: 27 July 2006
Revised: 14 September 2006
Accepted manuscript online:
PACS:
74.25.Op
(Mixed states, critical fields, and surface sheaths)
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