Vortex pinning properties in Fe-chalcogenides

Leo, Antonio; Grimaldi, Gaia; Guarino, Anita; Avitabile, Francesco; Nigro, A.; Galluzzi, Armando; Mancusi, D; Polichetti, Massimiliano; Pace, S.; Buchkov, K.; Nazarova, E.; Kawale, S.

doi:10.1088/0953-2048/28/12/125001

Cited by 48 publications

(38 citation statements)

References 30 publications

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“…By increasing the applied magnetic field from 0 T to 16 T, along the ab-plane orientation, the flux pinning energy tends to drop from~800 K to~310 K, while along the c-axis direction, it tends to drop from~680 K to~120 K. These flux pinning energy values are comparable to those reported for other IBSs, such as β-FeSe single crystals [18], Fe 1.06 Te 0.6 Se 0.4 [21] and Fe(Te,S) single crystals [22]. We note that a different choice of nexponent in the g(t) function can lead to U 0 values a factor of 3 lower than those evaluated in the case n = 1 [23]. On the other hand, by using a different approach, as the modified Thermally Activated Flux-Flow (TAFF) model [24], the estimated U 0 values could be higher by a factor of 5.…”

Section: Angular Dependence Of Flux Pinning Energysupporting

confidence: 78%

Effective Magnetic Field Dependence of the Flux Pinning Energy in FeSe0.5Te0.5 Superconductor

et al. 2021

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The role of a layered structure in superconducting pinning properties is still at a debate. The effects of the vortex shape, which can assume for example a staircase form, could influence the interplay with extrinsic pinning coming from the specific defects of the material, thus inducing an effective magnetic field dependence. To enlighten this role, we analysed the angular dependence of flux pinning energy U(H,θ) as a function of magnetic field in FeSe0.5Te0.5 thin film by considering the field components along the ab-plane of the crystal structure and the c-axis direction. U(H,θ) has been evaluated from magneto-resistivity measurements acquired at different orientations between the applied field up to 16 T and FeSe0.5Te0.5 thin films grown on a CaF2 substrate. We observed that the U(H,θ) shows an anisotropic trend as a function of both the intensity and the direction of the applied field. Such a behaviour can be correlated to the presence of extended defects elongated in the ab-planes, thus mimicking a layered superconductor, as we observed in the microstructure of the compound. The comparison of FeSe0.5Te0.5 with other superconducting materials provides a more general understanding on the flux pinning energy in layered superconductors.

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Section: Angular Dependence Of Flux Pinning Energysupporting

confidence: 78%

Effective Magnetic Field Dependence of the Flux Pinning Energy in FeSe0.5Te0.5 Superconductor

et al. 2021

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“…Although the superposition of different mechanisms is common (e.g. refs 46 and 47), their independence as revealed by different effective fields is unusual (one example is given by ref. 48, where, however, the high and low field regions were separately fitted using all exponents as free parameters).…”

Section: Discussionmentioning

confidence: 99%

Intrinsic and extrinsic pinning in NdFeAs(O,F): vortex trapping and lock-in by the layered structure

Tarantini

Iida

Hänisch

et al. 2016

Sci Rep

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Fe-based superconductors (FBS) present a large variety of compounds whose properties are affected to different extents by their crystal structures. Amongst them, the REFeAs(O,F) (RE1111, RE being a rare-earth element) is the family with the highest critical temperature Tc but also with a large anisotropy and Josephson vortices as demonstrated in the flux-flow regime in Sm1111 (Tc ∼ 55 K). Here we focus on the pinning properties of the lower-Tc Nd1111 in the flux-creep regime. We demonstrate that for H//c critical current density Jc at high temperatures is dominated by point-defect pinning centres, whereas at low temperatures surface pinning by planar defects parallel to the c-axis and vortex shearing prevail. When the field approaches the ab-planes, two different regimes are observed at low temperatures as a consequence of the transition between 3D Abrikosov and 2D Josephson vortices: one is determined by the formation of a vortex-staircase structure and one by lock-in of vortices parallel to the layers. This is the first study on FBS showing this behaviour in the full temperature, field, and angular range and demonstrating that, despite the lower Tc and anisotropy of Nd1111 with respect to Sm1111, this compound is substantially affected by intrinsic pinning generating a strong ab-peak in Jc.

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“…[15][16][17][18] Since FeCh tetrahedra could be incorporated in different superconducting materials, it is of interest to study critical currents and vortex pinning mechanism in tetragonal FeS. [19][20][21] Moreover, vortex pinning and dynamics is strongly related to coherence length and superconducting pairing mechanism.…”

Section: 14mentioning

confidence: 99%

Critical current density and vortex pinning in tetragonalFeS1−xSex(x=0,0.06)

et al. 2016

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We report critical current density (Jc) in tetragonal FeS single crystals, similar to iron based superconductors with much higher superconducting critical temperatures (Tc's). The Jc is enhanced 3 times by 6% Se doping. We observe scaling of the normalized vortex pinning force as a function of reduced field at all temperatures. Vortex pinning in FeS and FeS0.94Se0.06 shows contribution of core-normal surface-like pinning. Reduced temperature dependence of Jc indicates that dominant interaction of vortex cores and pinning centers is via scattering of charge carriers with reduced mean free path (δl), in contrast to KxFe2−ySe2 where spatial variations in Tc (δTc) prevails.

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Vortex pinning properties in Fe-chalcogenides

Cited by 48 publications

References 30 publications

Effective Magnetic Field Dependence of the Flux Pinning Energy in FeSe0.5Te0.5 Superconductor

Effective Magnetic Field Dependence of the Flux Pinning Energy in FeSe0.5Te0.5 Superconductor

Intrinsic and extrinsic pinning in NdFeAs(O,F): vortex trapping and lock-in by the layered structure

Critical current density and vortex pinning in tetragonalFeS1−xSex(x=0,0.06)

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