Josephson-Vortex-Glass Transition in Strong Fields

Ikeda, Ryusuke; Adachi, Hiroto

doi:10.1143/jpsj.69.2993

Cited by 10 publications

(4 citation statements)

References 35 publications

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“…Typically, in the organic and cuprate materials [36,38], the fluctuation effect is much stronger compared with those of CeCoIn 5 . Actually, a shorter coherence length tends to result in a larger Maki parameter and simultaneously to enhance the fluctuation even in the parallel field case [7,39]. Consequently, as shown in Sec.III, the MF-FOT behavior is rounded and is transmuted into a broad continuous crossover by the SC fluctuation, reflecting the absence of the true FOT at H c2 .…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, as shown in Sec.III, the MF-FOT behavior is rounded and is transmuted into a broad continuous crossover by the SC fluctuation, reflecting the absence of the true FOT at H c2 . Further, a remarkable field and temperature range of the vortex liquid region in which the resistance is finite may be created below H c2 (T )-curve even in the parallel field case [39] where the fluctuation effect is minimized. Since the FFLO-like state is limited to a narrow field range below H c2 , and the modulation parallel to the field does not lead to any ordering in the vortex liquid, the vortex liquid region should mask and erase the FFLO-like phase in a strongly fluctuating superconductor.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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

2003

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“…One of these phases is the "vortex slush" (VS) -a disordered, liquidlike phase with no superconducting phase coherence that is distinguished from the VL in that the translational correlation length in this phase is substantially larger than that in the VL. The existence of this phase in superconductors with random point pinning has been predicted theoretically 15,16 and several experimental studies 17,18,19 have presented evidence for the occurrence of a first-order transition between VL and VS phases (followed by a continuous transition from the VS to the VG phase) as the temperature is decreased at fixed magnetic field. A numerical study 14 has also provided evidence for the existence of the VS phase, although the validity of this evidence for macroscopic systems has been questioned in later work 20 .…”

Section: Introductionmentioning

confidence: 83%

“…We find that this phase is clearly polycrystalline (see top panels in Figs 1 and 4) with well defined crystalline domains separated by domain walls. It has characteristics of the VS phase discussed in the literature, 14,15,16,17,18,19 and of the also proposed 21,22 MG phase. We therefore characterize this phase (see Fig.…”

Section: Summary and Discussionmentioning

confidence: 99%

Phase diagram of randomly pinned vortex matter in layered superconductors: Dependence on the details of the point pinning

Dasgupta

Valls

2007

Phys. Rev. B

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We study the thermodynamic and structural properties of the superconducting vortex system in high temperature layered superconductors, with magnetic field normal to the layers, in the presence of a small concentration of strong random point pinning defects via numerical minimization of a model free energy functional in terms of the time-averaged local density of pancake vortices. Working at constant magnetic induction and point pinning center concentration, we find that the equilibrium phase at low temperature (T ) and small pinning strength (s) is a topologically ordered Bragg glass. As T or s is increased, the Bragg glass undergoes a first order transition to a disordered phase which we characterize as a "vortex slush" with polycrystalline structure within the layers and interlayer correlations extending to about twenty layers. This is in contrast with the pinned vortex liquid phase into which the Bragg glass was found to melt, using the same methods, in the case of a large concentration of weak pinning centers: that phase was amorphous with very little interlayer correlation. The value of the second moment of the random pinning potential at which the Bragg glass melts for a fixed temperature is very different in the two systems. These results imply that the effects of random point pinning can not be described only in terms of the second moment of the pinning potential, and that some of the unresolved contradictions in the literature concerning the nature of the low T and high s phase in this system are likely to arise from differences in the nature of the pinning in different samples, or from assumptions made about the pinning potential.

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Magnetic phase diagram of Josephson vortices in strongly anisotropic superconductor Bi-2212

Hirata¹,

Ooi²,

Sadki³

et al. 2004

Physica C: Superconductivity

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Josephson-Vortex-Glass Transition in Strong Fields

Abstract: A vortex-glass transition due to point disorder in layered superconductors is studied for the case with an applied field parallel to the layers. Our calculation of tilt responses indicates that,

Cited by 10 publications

References 35 publications

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

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

Phase diagram of randomly pinned vortex matter in layered superconductors: Dependence on the details of the point pinning

Magnetic phase diagram of Josephson vortices in strongly anisotropic superconductor Bi-2212

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