Influence of quenched disorder on the square-to-rhombohedral structural transformation of the vortex lattice of type-II superconductors

Li, D. P.; Lin, Pei-Jen; Rosenstein, Baruch; Shapiro, B. I.; Shapiro, I.

doi:10.1103/physrevb.74.174518

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…One of the most intriguing vortex phenomena is the second magnetization peak effect in the magnetic hysteresis (named the peak or 'fishtail' effect) originating from distinct non-linear modulations of the temperature and magnetic field dependencies of the critical current J c (H, T) due to pinning energy changes [4][5][6]. The proposed mechanisms and theoretical models deal particularly with the vortex-vortex and pinning center-vortex interactions as order/disorder phase transition (long/short range ordering) [7], structural (square/ rhombic lattice) transformation [8], elastic/plastic pinning crossover [6] and 3D/2D pinning change [9]. The peak effect has been thoroughly investigated for various superconductor systems: (i) conventional, like Nb alloys [10] and MgB 2 [11], and (ii) non-conventional such as cuprates [6,12] and iron based superconductors (IBSs), both pnictides [13][14][15][16][17] and chalcogenide FeSeTe systems [18].…”

Section: Introductionmentioning

confidence: 99%

Evidence of pinning crossover and the role of twin boundaries in the peak effect in FeSeTe iron based superconductor

Galluzzi

Buchkov

Tomov

et al. 2017

Supercond. Sci. Technol.

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The correlation between the appearance of a peak effect in the critical current of a superconducting material and the presence of twin boundaries, involved in a crossover between different pinning regimes, is investigated by means of dc magnetic measurements on a FeSe0.5Te0.5 crystal. In particular, by analyzing the temperature dependence of the critical current density Jc(T) for different magnetic fields H, a crossover from a weak pinning regime to a strong pinning regime has been revealed. The analysis shows that this crossover can be ascribed to the presence of twin boundary defects inside the sample, and can be associated to the onset of the peak effect and interpreted as the start of the vortex dynamic processes responsible for the increase of Jc with the field. On the basis of the information extracted by our analysis, a plausible dynamic scenario involving the contribution of the different pinning regimes depending on the applied field has been described, and the relative H(T) vortex phase diagram has been determined. Moreover, in our description, the peak in the Jc(H) curve corresponds to the end of the processes leading to the peak effect and it is confirmed to be related to the transition from an elastic to a plastic deformation regime in the vortex lattice.

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Section: Introductionmentioning

confidence: 99%

Evidence of pinning crossover and the role of twin boundaries in the peak effect in FeSeTe iron based superconductor

Galluzzi

Buchkov

Tomov

et al. 2017

Supercond. Sci. Technol.

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“…The gaussian approximation study of thermal fluctuations was however performed (Ikeda , 1995;Larkin and Varlamov, 2005) and used to explained the, so called crossing point of the magnetization curves, as well as crossover between the 3D to the 2D behavior (Baraduc et al, 1994;Huh and Finnemore, 2002;Junod et al, 1998;Lin and Rosenstein, 2005;Rosenstein et al, 2001;Salem-Sugui and Dasilva, 1994;Tešanović et al, 1992) In many simulations this model rather than GL was adopted (Ryu et al, 1996;Wilkin and Jensen, 1997). The GL model can be extended also in direction of introducing anisotropy in the a − b plane, like the four -fold symmetric anisotropy leading to transition from the rhombic lattice to the square lattice (Chang et al, 1998a,b;Klironomos and Dorsey, 2003;Park and Huse, 1998;Rosenstein and Knigavko, 1999) observed in many high T c and low T c type II superconductors alike (Eskildsen et al, 2001;Li et al, 2006a) . Dynamics Dynamics of vortex matter can be described by a time dependent generalization of the GL equations (Larkin and Varlamov, 2005).…”

Section: Microscopic Derivations Of the Gl Equationsmentioning

confidence: 99%

“…3) Sometimes there are one or more structural transitions in the lattice phase (Divakar et al, 2004;Eskildsen et al, 2001;Gilardi et al, 2002;Jaiswal-Nagar et al, 2006;Johnson et al, 1999;Keimer et al, 1994;Li et al, 2006a;McK. Paul et al, 1998;Sasagawa et al, 2000).…”

Section: Complexity Of the Vortex Matter Physicsmentioning

confidence: 99%

Ginzburg-Landau theory of type II superconductors in magnetic field

2010

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Thermodynamics of type II superconductors in electromagnetic field based on the GinzburgLandau theory is presented. The Abrikosov flux lattice solution is derived using an expansion in a parameter characterizing the "distance" to the superconductor -normal phase transition line. The expansion allows a systematic improvement of the solution. The phase diagram of the vortex matter in magnetic field is determined in detail. In the presence of significant thermal fluctuations on the mesoscopic scale (for example in high Tc materials) the vortex crystal melts into a vortex liquid. A quantitative theory of thermal fluctuations using the lowest Landau level approximation is given. It allows to determine the melting line and discontinuities at melt, as well as important characteristics of the vortex liquid state. In the presence of quenched disorder (pinning) the vortex matter acquires certain "glassy" properties. The irreversibility line and static properties of the vortex glass state are studied using the "replica" method. Most of the analytical methods are introduced and presented in some detail. Various quantitative and qualitative features are compared to experiments in type II superconductors, although the use of a rather universal Ginzburg -Landau theory is not restricted to superconductivity and can be applied with certain adjustments to other physical systems, for example rotating Bose -Einstein condensate.

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Magnetic phase diagram of type-II superconductors: From high Tc to low Tc superconductors

Lin

Rosenstein

2008

Physica C: Superconductivity

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Influence of quenched disorder on the square-to-rhombohedral structural transformation of the vortex lattice of type-II superconductors

Cited by 6 publications

References 39 publications

Evidence of pinning crossover and the role of twin boundaries in the peak effect in FeSeTe iron based superconductor

Evidence of pinning crossover and the role of twin boundaries in the peak effect in FeSeTe iron based superconductor

Ginzburg-Landau theory of type II superconductors in magnetic field

Magnetic phase diagram of type-II superconductors: From high Tc to low Tc superconductors

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