Improvements of high-field pinning properties of polycrystalline Fe(Se,Te) material by heat treatments

Zignani, C. Fiamozzi; Marzi, G. De; Corato, V.; Mancini, A.; Vannozzi, Angelo; Rufoloni, A.; Leo, Antonio; Guarino, Anita; Galluzzi, Armando; Nigro, A.; Polichetti, Massimiliano; Corte, A. della; Pace, S.; Grimaldi, Gaia

doi:10.1007/s10853-018-03218-5

Cited by 20 publications

(14 citation statements)

References 34 publications

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“…This feature could be exploited since these temperatures are typically considered for power applications of superconductivity. Moreover, comparing the F p values with those reported in the literature [16,38,68,69], it can be noted that they are similar to the values reported for other Fe(Se, Te) single crystals (10 7 ÷ 10 9 N/m 3 ) but they are much higher if compared with bulk and polycrystalline Fe(Se, Te) samples (10 5 ÷ 10 7 N/m 3 ). It is worth underlining that our F p values have been compared with the H||c field configuration reported in the literature.…”

Section: Resultssupporting

confidence: 85%

“…In fact, the IBSs showed low anisotropy values [2][3][4][5][6][7] and a preferable superconductor-normal-superconductor (SNS) behavior of the grain boundary junctions [8][9][10]. Despite their low T c values, it has been demonstrated that the IBSs can be suitable for magnet and wire production and/or highpower applications and high-current transport thanks to their high values of critical current density J c , irreversibility field and upper critical field [11][12][13][14][15][16] as well as their good inter-grain connectivity [8,13,17,18]. Among the various IBS families, the 11 family has attracted a lot of interest due to its very simple crystalline structure and to the possibility of easily doping it with several elements of the periodic table [19][20][21][22][23] in order to improve the superconducting properties of the compounds.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultssupporting

confidence: 85%

Section: Introductionmentioning

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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“…Briefly, 5 wt% Pb-added samples ( x = 0.05, y = 0) also enhanced the F p values, which are similar to the previous report [ 38 ] and higher than those of 1 wt% Pb- and Sn-added samples and their parent compounds. Furthermore, the obtained F p values of the parent compounds are almost the same as those reported (0.1–1 GN/m 3 ) in previous studies [ 52 , 56 ] based on polycrystalline Fe(Se, Te) samples. The F p behaviour leads us to the conclusion that improving the appropriate pinning centres is a reason for the enhancement of the critical current behaviours.…”

Section: Resultssupporting

confidence: 88%

“…There are also reports of similar results for Ag-added MgB 2 [ 54 ] and Sn-added alternative FBS bulk samples [ 50 ]. High-pressure techniques such as high-pressure growth and high-pressure sintering can be used to further improve the J c and F p of these samples [ 2 , 56 ].…”

Section: Resultsmentioning

confidence: 99%

Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe0.5Te0.5

et al. 2023

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The enhanced performance of superconducting FeSe0.5Te0.5 materials with added micro-sized Pb and Sn particles is presented. A series of Pb- and Sn-added FeSe0.5Te0.5 (FeSe0.5Te0.5 + xPb + ySn; x = y = 0–0.1) bulks are fabricated by the solid-state reaction method and characterized through various measurements. A very small amount of Sn and Pb additions (x = y ≤ 0.02) enhance the transition temperature (Tconset) of pure FeSe0.5Te0.5 by ~1 K, sharpening the superconducting transition and improving the metallic nature in the normal state, whereas larger metal additions (x = y ≥ 0.03) reduce Tconset by broadening the superconducting transition. Microstructural analysis and transport studies suggest that at x = y > 0.02, Pb and Sn additions enhance the impurity phases, reduce the coupling between grains, and suppress the superconducting percolation, leading to a broad transition. FeSe0.5Te0.5 samples with 2 wt% of cometal additions show the best performance with their critical current density, Jc, and the pinning force, Fp, which might be attributable to providing effective flux pinning centres. Our study shows that the inclusion of a relatively small amount of Pb and Sn (x = y ≤ 0.02) works effectively for the enhancement of superconducting properties with an improvement of intergrain connections as well as better phase uniformity.

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“…This value is approximately 35 K and it is consistent with the values reported in the literature [ 1 , 21 , 22 ]. It is worth noting the presence of a slight non-zero signal above T c in the ZFC curve as already reported in other works on iron-based systems [ 23 , 24 , 25 , 26 ], which can be limited by improving the fabrication processes [ 26 , 27 , 28 ].…”

Section: Resultsmentioning

confidence: 54%

Critical Current and Pinning Features of a CaKFe4As4 Polycrystalline Sample

et al. 2021

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We analyze the magnetic behavior of a CaKFe4As4 polycrystalline sample fabricated by a mechanochemically assisted synthesis route. By means of DC magnetization (M) measurements as a function of the temperature (T) and DC magnetic field (H) we study its critical parameters and pinning features. The critical temperature Tc has been evaluated by M(T) curves performed in Zero Field Cooling-Field Cooling conditions. These curves show the presence of a little magnetic background for temperatures above Tc, as also confirmed by the hysteresis loops M(H). Starting from the M(H) curves, the critical current density Jc of the sample has been calculated as a function of the field at different temperatures in the framework of the Bean critical state model. The Jc(H) values are in line with the ones reported in the literature for this typology of samples. By analyzing the temperature dependence of the critical current density Jc(T) at different magnetic fields, it has been found that the sample is characterized by a strong type pinning regime. This sample peculiarity can open perspectives for future improvement in the fabrication of this material.

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Improvements of high-field pinning properties of polycrystalline Fe(Se,Te) material by heat treatments

Cited by 20 publications

References 34 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

Cometal Addition Effect on Superconducting Properties and Granular Behaviours of Polycrystalline FeSe0.5Te0.5

Critical Current and Pinning Features of a CaKFe4As4 Polycrystalline Sample

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