Strong vortex pinning in FeSe0.5Te0.5 epitaxial thin film

Kawale, S.; Pallecchi, I.; Gerbi, Andrea; Buzio, Renato; Braccini, V.; Palenzona, A.; Putti, M.; Adamo, Maria; Sarnelli, E.

doi:10.1063/1.3688918

Cited by 40 publications

(33 citation statements)

References 21 publications

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“…2. Nonetheless, it is a clear indication to TAFF behavior together with many other measurements on Fe-based superconductors interpreted with the TAFF model [10][11][12][13][14]. TAFF fits over restricted resistance, temperature, and magnetic-field ranges with U small compared to T are often reported in the context of a SIT [15,16].…”

Section: Superconducting Phasesupporting

confidence: 53%

Superconducting and Insulating Phases of Disordered FeSe Thin Films in a Magnetic Field

et al. 2014

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The temperature-dependent electronic transport on the superconducting and insulating sides of the superconductor-insulator transition in disordered quasitwo-dimensional textured FeSe thin films is reported. The transition is driven by a perpendicular magnetic field applied to a film with its thickness close to the critical thickness of the thickness-, i.e., disorder-induced transition. The resistance in the superconducting phase might be dominated by thermally assisted flux flow, and in the phase diagram a metallic phase might intervene between the superconducting and insulating state at very low temperatures. In the insulating phase, weak insulating behavior is observed that can be described by weak localization theory of bosons, thus supporting the bosonic description of the superconductor-insulator transition in FeSe thin films.

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Section: Superconducting Phasesupporting

confidence: 53%

Superconducting and Insulating Phases of Disordered FeSe Thin Films in a Magnetic Field

et al. 2014

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“…c-axis peak) is visible for all magnetic fields, as displayed in the inset of figure 6(c). This peak is related to correlated defects confirmed by TEM acting as effective pinning centers parallel to the c-axis [11][12][13][14].…”

Section: Resultsmentioning

confidence: 66%

“…On the other hand, Imai et al showed that the superconducting properties are not well correlated to the lattice mismatch of the substrates but rather connected to the cell constants of the films [9,10]. Furthermore, films on SrTiO 3 show a peak in the angular dependence of J c for H || c [11][12][13]. Similar c-axis peaks in J c (θ) have been observed for films deposited on CaF 2 substrate [14].…”

Section: Introductionmentioning

confidence: 84%

Influence of substrate type on transport properties of superconducting FeSe_0.5Te_0.5thin films

Yuan¹,

Iida²,

Langer³

et al. 2015

Supercond. Sci. Technol.

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FeSe 0.5 Te 0.5 thin films were grown by pulsed laser deposition on CaF 2 , LaAlO 3 and MgO substrates and structurally and electro-magnetically characterized in order to study the influence of the substrate on their transport properties. The in-plane lattice mismatch between FeSe 0.5 Te 0.5 bulk and the substrates shows no influence on the lattice parameters of the films, whereas the type of substrates affects the crystalline quality of the films and, therefore, the superconducting properties. The film on MgO showed an extra peak in the angular dependence of critical current density J c (θ) at θ = 180° (H || c), which arises from c-axis defects as confirmed by transmission electron microscopy. In contrast, no J c (θ) peaks for H || c were observed in films on CaF 2 and LaAlO 3 . J c (θ) can be scaled successfully for both films without c-axis correlated defects by the anisotropic Ginzburg-Landau (AGL) approach with appropriate anisotropy ratio γ J . The scaling parameter γ J is decreasing with decreasing temperature, which is different from what we observed in FeSe 0.5 Te 0.5 films on Fe-buffered MgO substrates.

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“…No evidence of intrinsic pinning was observed in Ba122; however, enhancements in J c ( H//ab ) due to extended correlated planar defects were found16. Fe(Se,Te) films, despite their much lower T c , revealed a high J c 171819 with a low J c anisotropy1819 and surprisingly showed signs of intrinsic pinning below 8 K20. The intrinsic pinning properties of SmFeAs(O,F) and LaFeAs(O,F) single crystals were studied by Moll et al 21.…”

mentioning

confidence: 91%

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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Strong vortex pinning in FeSe0.5Te0.5 epitaxial thin film

Cited by 40 publications

References 21 publications

Superconducting and Insulating Phases of Disordered FeSe Thin Films in a Magnetic Field

Superconducting and Insulating Phases of Disordered FeSe Thin Films in a Magnetic Field

Influence of substrate type on transport properties of superconducting FeSe_0.5Te_0.5thin films

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

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Strong vortex pinning in FeSe0.5Te0.5 epitaxial thin film

Cited by 40 publications

References 21 publications

Superconducting and Insulating Phases of Disordered FeSe Thin Films in a Magnetic Field

Superconducting and Insulating Phases of Disordered FeSe Thin Films in a Magnetic Field

Influence of substrate type on transport properties of superconducting FeSe0.5Te0.5thin films

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

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Influence of substrate type on transport properties of superconducting FeSe_0.5Te_0.5thin films