Theory of Upper Critical Field without Energy Quantization

Details Theory of Upper Critical Field without Energy Quantization Theory of Upper Critical Field without Energy Quantization

2004-04-02

arxiv.org/abs/cond-mat/0404043v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, Revtex4

Scientific paper

Conventional theories for determining upper critical fields are inevitably related to the lowest eigenvalues of appropriate equations. In this Letter, a new theory of upper critical fields is designed and justified. Using MgB$_2$ as modeling prototype, our computations are in excellent agreement with the Ginzburg-Landau theory. The long-standing issue, the upward curvature of the upper critical field, is found to be a manifestation of the crossover of the order parameter. The current theory is an alternative to the traditional technique of energy quantization in determining upper critical fields.

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