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Rosenstein, Baruch; Shapiro, B. I.; Shapiro, I.; Bruckental, Y.; Shaulov, A.; Yeshurun, Y.

doi:10.1103/physrevb.72.144512

Cited by 55 publications

(60 citation statements)

References 49 publications

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“…On the other hand, based on the scenario (ii), Hsp corresponds to the phase transition field of the vortex lattice from the rhombic to the square structure. In Region (II), the vortex lattice softens as H approaches to Hsp, and the vortices are pinned more easily, resulting in increasing Jc [57]. In the following we briefly examine whether and how one can explain the present results based on the above scenarios.…”

Section: T) Region (Ii): Between Hon(t) -Hsp(t) Region (Iii): Betwementioning

confidence: 87%

Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals

et al. 2017

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* Both authors contributed equally to this work.In order to establish the doping dependence of the critical current properties in the iron-based superconductors, the in-plane critical current density (Jc) of BaFe2As2-based superconductors, Ba1-xKxFe2As2 (K-Ba122), Ba(Fe1-xCox)2As2 (Co-Ba122), and BaFe2(As1-xPx)2 (P-Ba122) in a wide range of doping concentration (x) was investigated by means of magnetization hysteresis loop (MHL) measurements on single crystal samples. Depending on the dopant elements and their concentration, Jc exhibits a variety of magneticfield (H)-and temperature (T)-dependences. (1) In the case of K-Ba122, the MHL of the under-doped samples (x ≤ 0.33) exhibits the second magnetization peak (SMP), which sustains high Jc at high H and high T, exceeding 10 5 A/cm 2 at T = 25 K and µ0H = 6 T for x = 0.30. On the other hand, the SMP is missing in the optimally-(x ~ 0.36-0.40) and over-doped (x ~ 0.50) samples, and consequently Jc rapidly decreases by more than one order of magnitude, although the change in Tc is within a few K. (2) For Co-Ba122, the SMP is always present over the entire superconducting (SC) dome from the under-(x ~ 0.05) to the over-doped (x ~ 0.12) region. However, the magnitude of Jc significantly changes with x, exhibiting a sharp maximum at x ~ 0.057, which is a slightly under-doped composition among Co-Ba122. (3) For P-Ba122, the highest Jc is attained at x = 0.30 corresponding to the highest Tc composition. For the over-doped samples, the MHL is characterized by a SMP located close to the irreversibility field Hirr. Common to the three doping variations, Jc becomes highest at the under-doping side of the SC dome near the phase boundary between the SC phase and the antiferromagnetic/orthorhombic (AFO) phase. Also, the peak appears in a narrow range of doping, distinct from the Tc dome with broad maximum. These similarities in the three cases indicate that the observed doping dependence of Jc is intrinsic to the BaFe2As2-based superconductors. The scaling analysis of the normalized pinning force density fp as a function of the reduced magnetic field h = H/Hirr (Hirr: irreversibility field) shows that the peak in the pinning force position (hmax) depends on x, indicating a change in pinning with x. On the other hand, high-Jc samples always attain similar hmax values of 0.40-0.45 for all the dopants, which may suggest that a common pinning source causes the highest Jc. A quantitative analysis of the Tdependent Jc indicates that the two pinning mechanisms, namely, the spatial variations in Tc (referred to as Tc pinning) and the fluctuations in the mean free path (l pinning), are enhanced for the under-doped samples, which results in the enhancement of Jc. Possible origins for the different pinning mechanism are discussed in connection with the x-dependence of Tc, the residual resistivity, AFO domain boundaries, and a possible quantum critical point.

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Section: T) Region (Ii): Between Hon(t) -Hsp(t) Region (Iii): Betwementioning

confidence: 87%

Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals

et al. 2017

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“…La 2−x Sr x CuO 4 , with x = 0.126 and similar doping, exhibits a broad SMP with characteristics that are strongly temperature dependent down to low temperature [52,56]. This behavior was explained by considering the softening of the vortex lattice associated with the square to rhombic vortex lattice transition as the source for the SMP [20,52]. Alternatively, the upward curvature in the T dependence of H on and H p in the low-T region may be explained as a dynamic effect caused by the finite current j s induced in the specimen during standard dc magnetization experiments, which reduces the effective pinning energy U (j s , T, H) [57].…”

Section: Phase Diagram and Second Magnetization Peakmentioning

confidence: 99%

Vortex dynamics and second magnetization peak in PrFeAsO0.60F0.12 superconductor

Bhoi

Mandal

Choudhury

2013

Journal of Applied Physics

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We have studied the vortex dynamics in the PrFeAsO0.60F0.12 superconducting sample by dc magnetization and dynamic magnetization-relaxation rate (Q) measurements. The field dependence of the superconducting irreversible magnetization Ms reveals a second magnetization peak or fishtail effect. The large value of Q is an indication of moderate vortex motion and relatively weak pinning energy. Data analysis based on the generalized inversion scheme suggests that the vortex dynamics can be described by the collective pinning model. The temperature dependence of the critical current is consistent with the pinning due to the spatial variation in the mean free path near a lattice defect (δl pinning). The temperature and field dependence of Q indicates a crossover from elastic to plastic vortex creep with increasing temperature and magnetic field. Finally, we have constructed the vortex phase diagram based on the present data.

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“…5,6 Fundamentally speaking, the mechanism and the origin of this effect is still much debated partly because it is system dependent with classification predominantly determined by superconducting anisotropy. [5][6][7][8][9][10] So far, flux-dynamics studies of the second magnetization peak in iron pnictides were performed on the systems, SmFeAsO 0.9 F 0.1 with T c = 55 K where the authors inferred weak and collective pinning, 11 NdFeAsO 0.85 ͑Ref. 12͒ and Ba͑Fe 1−x Co x ͒ 2 As 2 , the most studied system, where the peak effect appears only for samples near optimally doping [13][14][15][16][17][18] and weak and collective pinning are claimed in most of the works.…”

Section: Introductionmentioning

confidence: 99%

Flux dynamics associated with the second magnetization peak in the iron pnictideBa1−xKxFe2As<

et al. 2010

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We report on isofield magnetic relaxation data on a single crystal of Ba 1−x K x Fe 2 As 2 with superconducting transition temperature T c = 32.7 K which exhibit the so-called fish-tail effect. A surface map of the superconducting transition temperature shows that the superconducting properties are close to homogeneous across the sample. Magnetic relaxation data, M͑t͒, was used to obtain the activation energy U͑M͒ in order to study different vortex-dynamics regimes. Results of this analysis along with time-dependent measurements as a function of field and temperature extended to the reversible region of some M͑H͒ curves demonstrate that the irreversibility as well the second magnetization peak position, H p ͑T͒, are time dependent and controlled by plastic motion of the vortex state. In the region delimited by a characteristic field Hon

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Peak effect and square-to-rhombic vortex lattice transition inLa2−xSrxCuO4

Cited by 55 publications

References 49 publications

Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals

Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals

Vortex dynamics and second magnetization peak in PrFeAsO0.60F0.12 superconductor

Flux dynamics associated with the second magnetization peak in the iron pnictideBa1−xKxFe2As<

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