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Oscillations of magnetization and conductivity in anisotropic Fulde-Ferrell-Larkin-Ovchinnikov superconductors

François Konschelle, Jérôme Cayssol, Alexandre I. Buzdin

DOI 10.1103/PhysRevB.79.224526 · Physical Review B

T1

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Abstract

We derive the fluctuational magnetization and the paraconductivity of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconductors in their normal state. The FFLO superconducting fluctuations induce oscillations of the magnetization between diamagnetism and unusual paramagnetism which originates from the competition between paramagnetic and orbital effects. We also predict a strong anisotropy of the paraconductivity when the FFLO transition is approached in contrast with the case of a uniform BCS state. Finally building a Ginzburg-Levanyuk argument, we demonstrate that these fluctuation effects can be safely treated within the Gaussian approximation since the critical fluctuations are prominent only within an experimentally inaccessible temperature interval.

Source-reported materials — not catalogue approval

FormulaReported Tc (K)Pressure (GPa)Type
ErRh4B4

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—Pressure not reportedunknown
CeCoIn5

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—Pressure not reportedunknown
(BETS)2FeCl4

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—Pressure not reportedunknown
(BEDT-TTF)2Cu(NCS)2

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—Pressure not reportedunknown

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