Flux pinning and magnetic relaxation in Ga-doped LiFeAs single crystals

Shlyk, L.; Bischoff, Markus; Rose, Eva; Niewa, Rainer

doi:10.1063/1.4749804

Cited by 7 publications

(22 citation statements)

References 58 publications

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“…In this type of material, only one report concerning the pinning force scaling is reported so far. The work of Shlyk et al 65 reports a good scaling of F p versus the peak field, H(F p,max in Ga-doped LiFeAs. They obtained p = 2.06 and q = 0.71 from a fit to the Kramer theory.…”

Section: -Familymentioning

confidence: 95%

“…Additionally, the crtical current densities of an undoped sample were measured in Ref. 65 , but no F p -scaling was given which would allow a comparison.…”

Section: -Familymentioning

confidence: 99%

“…This shows that the Ga-doping is introducing a stronger variation of T c as compared to undoped samples of the same type. Additionally, the crtical current densities of an undoped sample were measured in Ref 65 ,. but no F p -scaling was given which would allow a comparison.E.…”

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Pinning force scaling analysis of Fe-based high-Tc superconductors

Koblischka

Muralidhar

2016

Int. J. Mod. Phys. B

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Pinning force data, F p , of a variety of Fe-based high-T c superconductors (11-, 111-, 122-and 1111-type) were analyzed by means of a scaling approach based on own experimental data and an extensive collection of literature data. The literature data were mostly replotted, but also converted from critical current measurements together with data for the irreversibility line when available from the same authors. Using the scaling approaches of Dew-Hughes [1] and Kramer [2], we determined the scaling behavior and the best fits to the theory. The data of most experiments analyzed show a good scaling behavior at high temperatures when plotting the normalized pinning force F p /F p,max versus the irreversibility field, H irr . The resulting peak positions, h 0 , were found at ≈0.3 for the 11-type materials, at ≈0.48 for the 111-type materials, between 0.32 and 0.5 for the 1111-type materials and between 0.25 and 0.71 for the 122-type materials. Compared to the typical results of Bi 2 Sr 2 CaCu 2 O 8+δ (h 0 ≈0.22) and YBa 2 Cu 3 O 7−δ (h 0 ≈0.33), most of the 122 and 1111 samples investigated show peak values higher than 0.4, which is similar to the data obtained on the light-rare earth 123-type HTSC like NdBa 2 Cu 3 O y . This high peak position ensures a good performance of the materials in high applied magnetic fields and is, therefore, a very promising result concerning the possible applications of the Fe-based high-T c superconductors.[1] E.

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Section: -Familymentioning

confidence: 95%

“…Additionally, the crtical current densities of an undoped sample were measured in Ref. 65 , but no F p -scaling was given which would allow a comparison.…”

Section: -Familymentioning

confidence: 99%

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Pinning force scaling analysis of Fe-based high-Tc superconductors

Koblischka

Muralidhar

2016

Int. J. Mod. Phys. B

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“…This allows one to study flux pinning in the material doped with a small amount of impurities without perturbations caused by local inhomogeneities of a fluxon lattice. To the best of our knowledge, only a few reports [6][7][8][9] concerning the flux pinning mechanism in pure LiFeAs and chemically doped material [10,11] have been reported so far. In this work we explore the effect of nonmagnetic Si on the superconducting properties and crystal structure of LiFeAs.…”

Section: Introductionmentioning

confidence: 99%

The influence of Si on the superconducting properties of LiFeAs single crystals

Shlyk¹,

Bischoff²,

Niewa³

2012

Supercond. Sci. Technol.

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The results of Si doping on the superconducting transition temperature, critical current density, irreversibility field, upper critical field, coherence length and magnetic relaxation of LiFeAs single crystals are reported for H c. The superconducting transition temperature of the Si doped sample decreases by about of 6.4 K/at.%, which is likely due to the pair breaking effect. The presence of a secondary high-field fishtail maximum, which shifts progressively with temperature, is associated with the extrinsic pinning centers created by Si. The increase of the critical current densities in intermediate magnetic fields of about three times as compared to our undoped material indicates that very small amounts of Si act as effective pinning sites for the flux pinning enhancement in the material. Pinning force curves measured at different temperatures obey a normalized form of Kramer's law, which indicates that the critical current density is limited by one predominant flux pinning mechanism. Analysis of the temperature and field dependences of the magnetic relaxation is consistent with the collective pinning model. The magnetic relaxation measurements combined with the peak position of the critical current density in the B-T phase diagram suggest an elastic-plastic transition of the vortex lattice at higher temperatures and fields.

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“…Most recent research regarding J c enhancement and pinning mechanisms is mainly focused on the 1111 system (RFeAsO, where R is a rare earth element), the 122 system (BaFe 2 As 2 , Ba 0.5 K 0.5 Fe 2 As 2 ) and the iron chalcogenide 11 system. Only one report has revealed the nature of the pinning mechanism in LiFeAs (111 type FeSCs) so far, despite its simple structure and reasonable T c value as compared to the 1111 and 122 types [28]. NaFeAs (T c ≈10K) experiences three successive phase transitions around 52, 41, and 23 K, which can be related to structural, magnetic, and superconducting transitions, respectively [29][30][31].…”

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Giant enhancement in critical current density, up to a hundredfold, in superconducting NaFe0.97Co0.03 As single crystals under hydrostatic pressure

Shabbir

Wang

Ghorbani

et al. 2015

Sci Rep

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Tremendous efforts towards improvement in the critical current density “Jc” of iron based superconductors (FeSCs), especially at relatively low temperatures and magnetic fields, have been made so far through different methods, resulting in real progress. Jc at high temperatures in high fields still needs to be further improved, however, in order to meet the requirements of practical applications. Here, we demonstrate a simple approach to achieve this. Hydrostatic pressure can significantly enhance Jc in NaFe0.97Co0.03As single crystals by at least tenfold at low field and more than a hundredfold at high fields. Significant enhancement in the in-field performance of NaFe0.97Co0.03As single crystal in terms of pinning force density (Fp) is found at high pressures. At high fields, the Fp is over 20 and 80 times higher than under ambient pressure at12 K and 14 K, respectively, at P = 1 GPa. We believe that the Co-doped NaFeAs compounds are very exciting and deserve to be more intensively investigated. Finally, it is worthwhile to say that by using hydrostatic pressure, we can achieve more milestones in terms of high Jc values in tapes, wires or films of other Fe-based superconductors.

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Flux pinning and magnetic relaxation in Ga-doped LiFeAs single crystals

Cited by 7 publications

References 58 publications

Pinning force scaling analysis of Fe-based high-Tc superconductors

Pinning force scaling analysis of Fe-based high-Tc superconductors

The influence of Si on the superconducting properties of LiFeAs single crystals

Giant enhancement in critical current density, up to a hundredfold, in superconducting NaFe0.97Co0.03 As single crystals under hydrostatic pressure

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