Transport and magnetic properties of yttrium doped NdFeAs(O,F) superconductor

Anooja, J. B.; Aswathy, P. M.; Varghese, Neson; Vinod, K.; Bharathi, A.; Syamaprasad, U.

doi:10.1016/j.jallcom.2013.02.125

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…The observation of Ref. 60 indicates that one may find still more materials with a strong flux pinning.…”

Section: E Remarks and Analysis Of The Pinning Force Datamentioning

confidence: 98%

“…The work of Ref. 60 demonstrated that by chemical doping this contribution can be stregthened, so their material exhibits the highest peak position measured so far in any type of high-T c superconductor. Therefore, the chemical doping enables to tune the flux pinning behavior also in most of the iron pnictide and selenide compounds.…”

Section: E Remarks and Analysis Of The Pinning Force Datamentioning

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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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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“…The observation of Ref. 60 indicates that one may find still more materials with a strong flux pinning.…”

Section: E Remarks and Analysis Of The Pinning Force Datamentioning

confidence: 98%

Section: E Remarks and Analysis Of The Pinning Force Datamentioning

confidence: 99%

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

Koblischka

Muralidhar

2016

Int. J. Mod. Phys. B

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“…In these family, the subgroup of 1111-type was the first discovered among all IBs [1], so it is also the most studied family with the biggest variety of compositions. Also, it should be noted that there is the highest transition temperature of superconductivity in this group of IBs [14][15][16][17], it can be due to the interlayer spacing of FeAs layers and the bond angle of Pn(Ch)-Fe-Pn(Ch) in this structure [18,19]. The substitution effect on this compound has showed the change in transition temperature [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Isovalent Substitution Effects of Arsenic on Structural and Electrical Properties of Iron-Based Superconductor NdFeAsO0.8F0.2

Alborzi

Daadmehr

2019

J Supercond Nov Magn

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In this paper, nominal compositions of NdFeAsO 0.8 F 0.2 , NdFeAs 0.95 Sb 0.05 O 0.8 F 0.2 and NdFeAs 0.95 P 0.05 O 0.8 F 0.2 were prepared by one-step solid-state reaction method. The structural, electrical and morphological properties of samples were characterized through the XRD pattern, the 4-probe method and SEM, respectively. The crystal structure of our samples was tetragonal with P4/nmm:2 symmetry group. Also, the (x, y, z), occupancy of ions and lattice parameters were changed by isovalent substitution of Phosphorus (P) and Antimony (Sb)in the NdFeAsO 0.8 F 0.2 sample. The ⍺, β bond angles and Fe-As bond length are changed from the corresponding value of ⍺ and β regular FeAs4-tetrahedron by isovalent doping P/As and Sb/As, that they are effective on the superconductivity transition temperature. The microstrain and crystalline size of samples were studied by the Williamson Hall method. The superconducting critical temperatures were attained at 56 K and 46 K for NdFeAsO 0.8 F 0.2 , NdFeAs 0.95 Sb 0.05 O 0.8 F 0.2 , respectively. The NdFeAs 0.95 P 0.05 O 0.8 F 0.2 showed the structural transition temperature at 140 K. It seems that there is a relation between the superconductivity and shrinkage of the crystal lattice. The flake-type of grains was observed by SEM pictures of samples.

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“…In general, all the samples show flaky nature characteristic of iron oxypnictide superconductors. Regarding RE1111 systems, we have observed considerable change in the grain morphology on substituting RE site with other dopants . In the present case, the flaky nature of the grains and the extent of layering and the grain size have enhanced dramatically with codoping.…”

Section: Resultsmentioning

confidence: 49%

SmFeAsO Superconductor with Preferred Crystallographic Orientation and Enhanced Critical Current Density

et al. 2014

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The effect of combined substitution of Sm 3+ and O 2− with Ca 2+ and F − , respectively, on the structural and superconducting properties of SmFeAsO system is investigated. It is observed that the binary doping using CaF 2 causes considerable structural as well as microstructural changes wherein the preferred orientation of (00 l) planes and enhancement of grain size are quite interesting. Moreover, a maximum T C of 53.8 K and a transport J C of 880 A/cm 2 (12 K) are achieved in the codoped samples. The achievement of preferred orientation, enhanced T C , and the subsequent increase in J C of the modified SmFe-AsO system are particularly significant for high current conductor development.

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Transport and magnetic properties of yttrium doped NdFeAs(O,F) superconductor

Cited by 7 publications

References 35 publications

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

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

Isovalent Substitution Effects of Arsenic on Structural and Electrical Properties of Iron-Based Superconductor NdFeAsO0.8F0.2

SmFeAsO Superconductor with Preferred Crystallographic Orientation and Enhanced Critical Current Density

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