Superconducting properties of iron chalcogenide thin films

Mele, P.

doi:10.1088/1468-6996/13/5/054301

Cited by 44 publications

(28 citation statements)

References 58 publications

(122 reference statements)

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“…This is not a problem since it is well known that Fe(Se, Te) is a weakly anisotropic material [6,70,71]. It is also an interesting observation that IBS systems tend to show stronger pinning abilities in samples with high crystalline morphology, such as thin films [11,[72][73][74], due to the effective naturally formed disorder. This will have a positive effect on the power stability and performance of various nano/micro-superconducting devices which similarly are affected by the vortex motion.…”

Section: Resultsmentioning

confidence: 99%

High Pinning Force Values of a Fe(Se, Te) Single Crystal Presenting a Second Magnetization Peak Phenomenon

et al. 2021

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The magnetization M of an Fe(Se, Te) single crystal has been measured as a function of temperature T and dc magnetic field H. The sample properties have been analyzed in the case of a magnetic field parallel to its largest face H||ab. From the M(T) measurement, the Tc of the sample and a magnetic background have been revealed. The superconducting hysteresis loops M(H) were between 2.5 K and 15 K showing a tilt due to the presence of a magnetic signal measured at T > Tc. From the M(H) curves, the critical current density Jc(H) has been extracted at different temperatures showing the presence of a second magnetization peak phenomenon. By extracting and fitting the Jc(T) curves at different fields, a pinning regime crossover has been identified and shown to be responsible for the origin of the second magnetization peak phenomenon. Then, the different kinds of pinning centers of the sample were investigated by means of Dew-Hughes analysis, showing that the pinning mechanism in the sample can be described in the framework of the collective pinning theory. Finally, the values of the pinning force density have been calculated at different temperatures and compared with the literature in order to understand if the sample is promising for high-current and high-power applications.

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Section: Resultsmentioning

confidence: 99%

High Pinning Force Values of a Fe(Se, Te) Single Crystal Presenting a Second Magnetization Peak Phenomenon

et al. 2021

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“…Very recently, a similar study of J c in FeSe 0.5 Te 0.5 thin films deposited on CaF 2 estimated by means of LT-SHPM was reported: J c was estimated 1 MA/cm 2 , three times higher than the value directly measured by the four-probe method. 15,16 Analyzing the behavior of J c with the field shown in Fig. 1, we notice a very weak field dependence especially at low temperatures -J c halves increasing the magnetic field from 0 to 9 Tbut the more striking feature is the complete isotropy of J c at 4 and 9.5 K. In Fig.…”

mentioning

confidence: 81%

Highly effective and isotropic pinning in epitaxial Fe(Se,Te) thin films grown on CaF2 substrates

Braccini

Kawale

Reich

et al. 2013

Applied Physics Letters

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We report on the isotropic pinning obtained in epitaxial Fe(Se,Te) thin films grown on CaF2(001) substrate. High critical current density values - larger than 1 MA/cm(2) in self field and liquid helium - are reached together with a very weak dependence on the magnetic field and a complete isotropy. Analysis through transmission electron microscopy evidences the presence of defects looking like lattice disorder at a very small scale, between 5 and 20 nm, which are thought to be responsible for such isotropic behavior in contrast to what was observed on SrTiO3, where defects parallel to the c-axis enhance pinning in that direction

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“…Since the discovery of superconductivity in bulk Fe-based compounds, great efforts have been devoted to the preparation of thin films of different classes of iron (Fe) based superconductors (IBS) on various substrates. [1][2][3][4][5][6] The thin films are useful to understand the basic intrinsic properties of IBS which are comparatively difficult to study in bulk single crystalline samples due to the small size of grown crystals of some of the IBSs, such as LnFeAs(O, F). 1 The high quality epitaxial thin films of IBS are suitable for the production of Fe based superconducting devices such as superconducting quantum interface devices (SQUIDs), coated conductors (tapes) and Josephson junctions.…”

Section: Introductionmentioning

confidence: 99%

Vortex state study of superconducting Fe(Te, Se) thin films deposited on SrTiO3 substrate by pulsed laser deposition technique

2019

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Superconducting thin films of two thicknesses have been fabricated on (100) oriented SrTiO 3 (STO) substrates using the target of composition Fe 1.05 Te 0.50 Se 0.50 by pulsed laser deposition technique. The structural and transport properties of the fabricated thin films have been investigated and the results indicate the enhancement in the superconducting properties with increasing thickness of the thin films. The onset of the superconducting transition temperature of the grown thin films of thicknesses ∼78 nm and ∼177 nm are ∼12.10 and 12.62 K at 0 T magnetic field, respectively. To estimate the upper critical fields H C2 (0), thermally activated energy (TAE) and vortex phase diagram, the magnetoresistance measurements have been performed in the magnetic field range of 0-8 T. H C2 (0) have been calculated by Ginzburg Landau (GL) theory and Werthamer-Helfand-Hohenberg model by taking the criterion of 90%, 50% and 10% of normal state resistivity and the corresponding GL coherence lengths have also been calculated. In the present work, the TAE has been estimated by conventional Arrhenius relation and modified thermally activated flux flow (TAFF) theory. The power law dependence of TAE, shows prominently the possible planer defects in the system. From the modified TAFF model, the values of fitting parameter 'q' suggests the 3 dimensional behaviour of the vortices for both the grown thin films. The vortex phase diagram study reveals the transition from the vortex liquid to vortex glass state.

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Superconducting properties of iron chalcogenide thin films

Cited by 44 publications

References 58 publications

High Pinning Force Values of a Fe(Se, Te) Single Crystal Presenting a Second Magnetization Peak Phenomenon

High Pinning Force Values of a Fe(Se, Te) Single Crystal Presenting a Second Magnetization Peak Phenomenon

Highly effective and isotropic pinning in epitaxial Fe(Se,Te) thin films grown on CaF2 substrates

Vortex state study of superconducting Fe(Te, Se) thin films deposited on SrTiO3 substrate by pulsed laser deposition technique

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