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Amigó, M.L.; Ale Crivillero, M.V.; Franco, D.G.; Guimpel, J.; Nieva, G. |
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Title |
Influence of the Fe Concentration on the Superconducting Properties of Fe_{1-y}Se |
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Journal Article |
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Year |
2015 |
Publication |
Journal of Low Temperature Physics |
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Volume |
179 |
Issue |
1-2 |
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15-20 |
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Keywords |
Chalcogenide; Vortex pinning; Correlated defects; Electrical transport; Fe deficiency |
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Abstract |
We present a comparative study of electrical transport properties in the normal state and in the dissipative superconducting state between pure TeX -FeSe phase and Fe deficient Fe TeX Se crystals. We discuss the influence of the intergrowth of the magnetic hexagonal phase (Fe TeX Se TeX ) in Fe deficient samples when compared to pure TeX -FeSe samples. In the superconducting state, we measured the TeX -plane electrical resistivity with magnetic field up to 16 T and the electrical resistivity as a function of the angle between the TeX axis and the applied field. The angular dependence at fixed temperature below the superconducting critical temperature, TeX , is very different for both sets of crystals. The Fe deficient samples display a vortex pinning-related feature at TeX 57 TeX off the plane while the pure TeX -FeSe phase samples show the persistence of a strong angular-dependent magnetoresistance characteristic of the normal state electronic structure. |
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Springer US |
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0022-2291 |
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BT @ pedrazp @ |
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712 |
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Kim, J.; Haberkorn, N.; Gofryk, K.; Graf, M.J.; Ronning, F.; Sefat, A.S.; Movshovich, R.; Civale, L. |
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Title |
Superconducting properties in heavily overdoped Ba(Fe0.86Co0.14)2As2 single crystals |
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Journal Article |
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Year |
2015 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
201 |
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20-24 |
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Keywords |
A. Iron arsenide superconductors; B. Upper critical field; C. Magnetic penetration depth; D. Vortex pinning |
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Abstract
We report the intrinsic superconducting parameters in a heavily overdoped Ba(Fe1−xCox)2As2 (x=0.14) single crystal and their influence in the resulting vortex dynamics. We find a bulk superconducting critical temperature of 9.8 K, magnetic penetration depth λab (0)=660±50 nm, coherence length ξab (0)=6.4±0.2 nm, and the upper critical field anisotropy γT→Tc≈3.7. The vortex phase diagram, in comparison with the optimally doped compound, presents a narrow collective creep regime. The intrinsic pinning energy plays an important role in the resulting vortex dynamics as compared with similar pinning landscape and comparable intrinsic thermal fluctuations. |
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0038-1098 |
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BT @ pedrazp @ |
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724 |
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Kim, J.; Haberkorn, N.; Nazaretski, E.; Paula, R. de; Tan, T.; Xi, X.X.; Tajima, T.; Movshovich, R.; Civale, L. |
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Title |
Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film |
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Journal Article |
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Year |
2015 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
204 |
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Pages |
56-60 |
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Keywords |
A. Superconducting materials; B. Films; C. Magnetic penetration depth; D. Vortex pinning |
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We report the influence of two-band superconductivity on the flux creep and the critical current densities of a MgB2 thin film. The small magnetic penetration depth of λ=50±10 nm at T=4 K is related to a clean π-band. We find a high self-field critical current density Jc, which is strongly reduced with applied magnetic field, and attribute this to suppression of the superconductivity in the π-band. The temperature dependence of the creep rate S (T) at low magnetic field can be explained by a simple Anderson–Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field. |
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0038-1098 |
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BT @ pedrazp @ |
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729 |
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Author |
D'Anna, G.; Andr |
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Title |
Flux-line response in 2H-NbSe2 investigated by means of the vibrating superconductor method |
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Journal Article |
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Year |
1993 |
Publication |
Physica C: Superconductivity and its applications |
Abbreviated Journal |
Phys C Supercond Appl |
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Volume |
218 |
Issue |
1-2 |
Pages |
238-244 |
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Keywords |
Crystals; Defects; Electric currents; Electric losses; Hydrogenation; Niobium compounds; Phase diagrams; Thermal effects; Critical currents; Flux line response; Hydrogenated niobium selenide single crystals; Peak effect; Transverse AC losses; Vibrating superconductor method; Vortex pinning regime; Superconducting materials |
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We measure transverse AC losses in the low- and high-amplitude regime of 2H-NbSe2 single crystals using vibrating superconductor methods. The measurements are sensitive to small deviations of the critical state. The data constitute evidence for a peak effect of the critical current as a function of the temperature in this compound. We construct in the H-T phase diagram the “peak-effect” line which is supposed to mark an abrupt cross-over in the vortex-pinning regime. |
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AT and T Bell Laboratories, Murray Hill, NJ 07974, United States |
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09214534 (ISSN) |
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Cited By (since 1996): 13; Export Date: 28 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: D'Anna, G.; D |
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BT @ luzuriag @ |
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521 |
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