Pauli Paramagnetism and Superconducting State

Maki, Kazumi; Tsuneto, Toshihiko

doi:10.1143/ptp.31.945

Cited by 299 publications

(253 citation statements)

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“…3 is of second order. In the Pauli limit, the second-order transition is suppressed with decreasing temperature and below T c (T )/T c (0) = 0.56 it becomes the first-order [12,13]. In Fig.…”

Section: Resultsmentioning

confidence: 90%

Thickness-Dependent Oscillations of the Critical Magnetic Field Induced by the Quantum Size Effect in Superconducting Nanofilms

Wójcik

2014

J Supercond Nov Magn

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The superconductor to normal metal transition driven by the in-plane magnetic field is investigated for Al nanofilms. Taking the Pauli breaking mechanism (with no orbital effect) into account, it is shown that the critical field oscillates as a function of the nanofilm thickness. This effect is discussed in terms of the quantization of electron energy caused by the confinement of its motion in the direction perpendicular to the film. The analysis of the critical field in the context of Clogston-Chandrasekhar limit is also included.

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Section: Resultsmentioning

confidence: 90%

Thickness-Dependent Oscillations of the Critical Magnetic Field Induced by the Quantum Size Effect in Superconducting Nanofilms

Wójcik

2014

J Supercond Nov Magn

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“…Traditionally, effects of Pauli paramagnetism on superconductors with a spin-singlet Cooper-pairing have been discussed by simply focusing on two energy scales [1,2]; the superconducting (SC) condensation energy and the Zeeman energy preventing the singlet pairing. This is a reasonable explanation on the first order transition (FOT) in an exceptional case with no orbital depairing creating field-induced vortices, i.e., a thin-film superconductor in parallel fields [3].…”

Section: Introductionmentioning

confidence: 99%

Effects of Pauli paramagnetism on the superconducting vortex phase diagram in strong fields

2003

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The Ginzburg-Landau (GL) functional and the resultant phase diagram of quasi two-dimensional superconductors in strong fields perpendicular to the layers, where the Pauli paramagnetic depairing is not negligible, are examined in details by assuming the weak coupling BCS model with a d x 2 −y 2 -like pairing. It is found that the temperature at which the mean field (MF) transition at Hc2 changes into a discontinuous one lies much above another temperature at which a line HFFLO(T ) of transition to a helical FFLO-like vortex solid may begin to appear. In addition to MF results, details of a real phase diagram near Hc2(T )-line are examined based on a theoretical argument and Monte Carlo simulations, and it is found that the MF discontinuous transition is changed due to the fluctuation into a crossover which is nearly discontinuous in systems with weak enough fluctuation. These results are consistent both with the MF discontinuous behavior and a suggestion of HFFLO(T ) in the heavy fermion superconductor CeCoIn5 with weak fluctuation and with their absence in cuprate and organic superconductors with strong fluctuation.

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“…The high-field FFLO phase was originally suggested for superconductors with ferromagnetically aligned impurities, 1,2 but it was soon realized that a FFLO state should develop in superconductors in an external field if the Zeeman coupling dominates the orbital coupling. 3,4,5 A number of layered organic superconductors have been suggested as candidates for FFLO phases. 6,7,8,9,10,11 However, recent interest has focussed on the heavyfermion material CeCoIn 5 .…”

Section: Introductionmentioning

confidence: 99%

Phase diagram and spectroscopy of Fulde-Ferrell-Larkin-Ovchinnikov states of two-dimensionald-wave superconductors

2005

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Experimental evidence suggests that the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state may be realized in the unconventional, heavy-fermion superconductor CeCoIn5. We present a self-consistent calculation of the field versus temperature phase diagram and order parameter structures for the FFLO states of quasi-two-dimensional d-wave superconductors. We calculate the spatially nonuniform order parameter, free energy density, and local density of states for magnetic fields parallel to the superconducting planes. We predict that the lower critical magnetic field transition between the spatially uniform and nonuniform FFLO state is second order. We discuss the signatures of the nonuniform FFLO state which should be observable in scanning tunneling microscopy measurements of the local density of states.

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Pauli Paramagnetism and Superconducting State

Cited by 299 publications

References 0 publications

Thickness-Dependent Oscillations of the Critical Magnetic Field Induced by the Quantum Size Effect in Superconducting Nanofilms

Thickness-Dependent Oscillations of the Critical Magnetic Field Induced by the Quantum Size Effect in Superconducting Nanofilms

Effects of Pauli paramagnetism on the superconducting vortex phase diagram in strong fields

Phase diagram and spectroscopy of Fulde-Ferrell-Larkin-Ovchinnikov states of two-dimensionald-wave superconductors

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