High field vortex phase diagram of Fe(Se, Te) thin films

Kawale, S.; Caglieris, Federico; Braccini, V.; Lamura, G.; Pellegrino, L.; Sala, Alberto; Putti, M.; Jost, A.; Zeitler, U.; Tarantini, C.; Jaroszyński, J.

doi:10.1088/0953-2048/27/4/044007

Cited by 36 publications

(30 citation statements)

References 28 publications

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“…The deposition was carried out at a residual gas pressure of 10 -8 mbar while the template was kept at around 320 °C. The parameters of the laser used during the deposition are 3 Hz as laser repetition rate, 2 J/cm 2 as laser fluency (2 mm 2 spot size) and 5 cm as distance between target and sample [13]. The thickness of the films was controlled by the deposition time.…”

Section: Methodsmentioning

confidence: 99%

Fe(Se,Te) coated conductors deposited on simple rolling-assisted biaxially textured substrate templates

Sylva¹,

Augieri²,

Mancini³

et al. 2019

Supercond. Sci. Technol.

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In this paper the feasibility of Fe(Se,Te) Coated Conductors (CC) on simple Rolling-Assisted Biaxilly Textured Substrate (RABiTS) template is studied. Starting from commercially available NiW5% tapes from Evico which have an out-of-plane orientation of about 6° and an in-plane orientation of 5.3°, a RABiTS template for Fe(Se,Te) coated conductors was realized depositing CeO2 thin films on the metallic tape. The oxide buffer layers, deposited via Pulsed Laser Ablation, have an out-of-plane and an in-plane orientation suitable for Fe(Se,Te) deposition and act as a chemical barrier against Ni diffusion. The Fe(Se,Te) deposited on such a simple template show a superconducting transition Tc of 18 K, very high upper critical field values with a Tc,0 of only 3 K in 18 T and self-field transport isotropic critical current values of 10 5 A/cm 2 at 4.2 K, which is reduced of less than one order of magnitude up to 16 T.

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Section: Methodsmentioning

confidence: 99%

Fe(Se,Te) coated conductors deposited on simple rolling-assisted biaxially textured substrate templates

Sylva¹,

Augieri²,

Mancini³

et al. 2019

Supercond. Sci. Technol.

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“…Quantitatively, the slope of ρ ff (B) for B → 0 can be extracted and compared to the expected dependence ρ ff = αρ n B/B c2 , where the adimensional slope α is connected to the microscopic properties of the superconductor, in terms of the nature of the quasi-particles density of states [53,54] and of the features of the superconducting gap, including the extension to anisotropic [55] and multiple gaps [20,56,57]. By roughly estimating B c2 ∼ 37 T at 12 K from literature data [58], α(B → 0) ∼ 1, smaller than the values > 1 expected in multiple gap superconductors and actually observed also in other FeSe x Te 1−x thin film [21], and larger than what detected in single crystals [20]. These puzzling results, the study of α, the whole B-dependence of ρ f f and its evolution with temperature is outside the scope of this work, and is postponed to future in-depth analyses.…”

Section: Discussionmentioning

confidence: 99%

Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance

Pompeo,

Torokhtii,

Alimenti

et al. 2020

Preprint

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We present high frequency measurements of the vortex dynamics of a FeSe x Te 1−x (x = 0.5) thin film grown on a CaF 2 substrate and with a critical temperature T c ≃ 18 K, performed by means of a dual frequency dielectric resonator at 16.4 GHz and 26.6 GHz. We extract and discuss various important vortex parameters related to the pinning properties of the sample, such as the characteristic frequency ν c , the pinning constant k p and the pinning barrier height U relevant for creep phenomena. We find that the vortex system is in the single-vortex regime, and that pinning attains relatively high values in terms of k p , indicating significant pinning at the high frequencies here studied. The pinning barrier energy U is quite small and exhibits a non-monotonous temperature dependence with a maximum near 12 K. This result is discussed in terms of core pinning of small portion of vortices of size ∝ ξ 3 jumping out of the pinning wells over very small distances, a process which is favoured in the high frequency, short ranged vortex oscillations here explored.

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“…The density of acquired data reveals that the U 0 (H) crossover is more gradual then usually seen in previous works. Thus, it is difficult to identify proper linear regions and enlarging/narrowing the range can significantly change the α estimation results, as it happens for example in the case of [33]. Also, the model used to evaluate the U 0 (H) values can affect the value of α obtained by the fitting procedure [21].…”

Section: Magnetic Field Dependence Of Flux Pinning Energymentioning

confidence: 99%

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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High field vortex phase diagram of Fe(Se, Te) thin films

Cited by 36 publications

References 28 publications

Fe(Se,Te) coated conductors deposited on simple rolling-assisted biaxially textured substrate templates

Fe(Se,Te) coated conductors deposited on simple rolling-assisted biaxially textured substrate templates

Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance

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

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