Pauli-Limited Superconductivity with Classical Magnetic Fluctuations

Details Pauli-Limited Superconductivity with Classical Magnetic Fluctuations Pauli-Limited Superconductivity with Classical Magnetic Fluctuations

2010-03-31

arxiv.org/abs/1003.6126v1

Physical Review B, 81, 224501 (2010)

Physics

Condensed Matter

Superconductivity

16 pages, 9 figures

Scientific paper

10.1103/PhysRevB.81.224501

We examine the effect of classical magnetic fluctuations on the phase diagram of paramagneticallylimited two-dimensional superconductors under a Zeeman magnetic field. We derive the free energy expansion in powers of the superconducting order parameter and analyze the character of the normalsuperconducting transition. While the transition is of the second order for all temperatures in the absence of magnetic fluctuations, we find that proximity to magnetism drives both the transition into the uniform state and that into the modulated (Fulde-Ferrell-Larkin-Ovchinnikov, FFLO) state to first order at intermediate temperatures. We compute the thermodynamic signatures of the normal-superconducting transition along the upper critical field.

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