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Theory of fluctuations in a two-band superconductor: MgB2 A. E. Koshelev,1 A. A. Varlamov,1,2 and V. M. Vinokur1
 

Summary: Theory of fluctuations in a two-band superconductor: MgB2
A. E. Koshelev,1 A. A. Varlamov,1,2 and V. M. Vinokur1
1Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne Illinois 60439, USA
2Coherentia-INFM, via del Politecnico, 1, 00133 Rome, Italy
Received 27 August 2004; revised manuscript received 29 April 2005; published 26 August 2005
A theory of fluctuations in two-band superconductor MgB2 is developed. Since the standard Ginzburg-
Landau GL approach fails in description of its properties, we generalize it based on the microscopic theory
of a two-band superconductor. Calculating the microscopic fluctuation propagator, we build up the nonlocal
two-band GL functional and the corresponding time-dependent GL equations. This allows us to calculate the
main fluctuation observables such as fluctuation specific heat and conductivity.
DOI: 10.1103/PhysRevB.72.064523 PACS number s : 74.40. k, 74.70.Ad, 74.20.De, 74.20.Fg
I. INTRODUCTION
The celebrated phenomenological Ginzburg-Landau1
GL theory of superconductivity proved to be one of most
fruitful and universal tools in the description basic properties
of superconductors. The examples of its success range from
the prediction of the Abrikosov vortex state2 to the recent
advance in understanding the complex vortex phase diagram
of high-temperature superconductors3
and the properties of

  

Source: Alexei, Koshelev - Materials Science Division, Argonne National Laboratory

 

Collections: Materials Science; Physics