Analytic Density of States in the Abrikosov-Gorkov Theory

Details Analytic Density of States in the Abrikosov-Gorkov Theory Analytic Density of States in the Abrikosov-Gorkov Theory

2007-02-17

arxiv.org/abs/cond-mat/0702404v1

Physics

Condensed Matter

Superconductivity

5 pages, 1 figure

Scientific paper

10.1016/j.ssc.2007.11.030

Since the early 1960s, Abrikosov-Gorkov theory has been used to describe superconductors with paramagnetic impurities. Interestingly, the density of states resulting from the theoretical framework has to date only been known approximately, as a numeric solution of a complex polynomial. Here we introduce an exact analytic solution for the density of states of a superconductor with paramagnetic impurities. The solution is valid in the whole regime of Abrikosov-Gorkov theory; both where there is an energy gap and gapless. While of fundamental interest, we argue that this solution also has computational benefits in the evaluation of integrals for tunneling conductances and allows for an analytic description of materials with densities of states that are modeled from the basic Abrikosov-Gorkov density of states.

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