| Records |
Author  |
Ale Crivillero, M.V.; Amigó, M.L.; Franco, D.G.; Badía-Majós, A.; Guimpel, J.; Nieva, G. |
| Title |
In Plane Vortex Dynamic Anisotropy in the Iron Deficient Fe_{1-y}Se Superconductor |
Type |
Journal Article |
| Year |
2015 |
Publication |
Journal of Low Temperature Physics |
Abbreviated Journal |
J. Low Temp. Phys. |
| Volume |
179 |
Issue |
1-2 |
Pages |
9-14 |
| Keywords |
Iron-based superconductors; Electrical transport; Critical currents |
| Abstract |
We present electrical transport measurements in the superconducting dissipative state of crystalline iron deficient Fe 1−y Se samples. These iron deficient samples were synthesized using NaCl/KCl flux and are characterized by the presence of correlated defects. The dissipation in electrical transport experiments, when the driving current is perpendicular or parallel to the crystal planes, depends strongly on the direction of the applied magnetic field , ( H=12 T), within the sample plane. There is a dissipation modulation each 60∘ due to the presence of the correlated defects. We correlate these angular dependent features with the variation of the critical currents ( Jc ) changing the direction of H confined in the crystals planes. Jc was measured from magnetization loops at fixed temperatures and angles of H always within the basal planes. |
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Springer US |
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0022-2291 |
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BT @ pedrazp @ |
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708 |
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Ale Crivillero, M.V.; Amigó, M.L.; Haberkorn, N.; Nieva, G.; Guimpel, J. |
| Title |
Microstructural control of the transport properties of β-FeSe films grown by sputtering |
Type |
Journal Article |
| Year |
2019 |
Publication |
Journal of Applied Physics |
Abbreviated Journal |
Journal of Applied Physics |
| Volume |
126 |
Issue |
11 |
Pages |
115303 |
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American Institute of Physics |
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0021-8979 |
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doi: 10.1063/1.5094131 |
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BT @ gnieva @ |
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847 |
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Ale Crivillero, M.V.; Haberkorn, N.; Nieva, G.; Guimpel, J. |
| Title |
Electrical transport properties of FeSe/Fe3O4 bilayers |
Type |
Journal Article |
| Year |
2019 |
Publication |
Materials Today: Proceedings |
Abbreviated Journal |
XXIII Latin American Symposium on Solid State Physics (SLAFES XXIII), San Carlos de Bariloche, Argen |
| Volume |
14 |
Issue |
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Pages |
18-21 |
| Keywords |
FeSe thin films; Magnetite thin films; Superconductivity |
| Abstract |
In this work, we study the electronic properties of FeSe/Fe3O4 bilayers deposited onto SrTiO3 (100) and MgO (100) substrates by DC magnetron sputtering. The comparative study of Fe3O4 films grown on SrTiO3 and MgO reveals significant differences in the intensity of the Verwey transition (Tv∼130K). This allows us to probe the impact of the distortions associated to the Verwey transition on the transport properties of the FeSe over-layer in the FeSe/Fe3O4 bilayers. A correlated increase in the resistance and weakened superconducting properties are observed.. |
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2214-7853 |
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BT @ gnieva @ |
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846 |
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Amigó, M.L.; Ale Crivillero, M.V.; Franco, D.G.; Badía–Majós, A.; Guimpel, J.; Campo, J.; Damay, F.; Porcher, F.; Condó, A.M.; Nieva, G. |
| Title |
Intrinsic pinning by naturally occurring correlated defects in FeSe 1− x Te x superconductors |
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Journal Article |
| Year |
2017 |
Publication |
Superconductor Science and Technology |
Abbreviated Journal |
Supercond. Sci. Technol. |
| Volume |
30 |
Issue |
8 |
Pages |
085010 |
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We study the angular dependence of dissipation in the superconducting state of FeSe and Fe(Se 1− x Te x ) through electrical transport measurements, using crystalline intergrown materials. We reveal the key role of the inclusions of the non superconducting magnetic phase Fe 1− y (Se 1− x Te x ), growing into the Fe(Se 1− x Te x ) pure β -phase, in the development of a correlated defect structure. The matching of both atomic structures defines the growth habit of the crystalline material as well as the correlated planar defects orientation. |
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0953-2048 |
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BT @ pedrazp @ |
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773 |
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| Author |
Amigó, M.L.; Ale Crivillero, M.V.; Franco, D.G.; Guimpel, J.; Nieva, G. |
| Title |
Influence of the Fe Concentration on the Superconducting Properties of Fe_{1-y}Se |
Type |
Journal Article |
| Year |
2015 |
Publication |
Journal of Low Temperature Physics |
Abbreviated Journal |
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| Volume |
179 |
Issue |
1-2 |
Pages |
15-20 |
| Keywords |
Chalcogenide; Vortex pinning; Correlated defects; Electrical transport; Fe deficiency |
| 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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| Author |
Amigó, M.L.; Crivillero, V.A.; Franco, D.G.; Badía-Majós, A.; Guimpel, J.; Nieva, G. |
| Title |
Vortex pinning by intrinsic correlated defects in Fe<inf>1-y</inf>Se |
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Journal Article |
| Year |
2014 |
Publication |
Journal of Physics: Conference Series |
Abbreviated Journal |
J. Phys.: Conf. Ser. |
| Volume |
507 |
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Part 1 |
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Cited By :1; Export Date: 14 March 2018 |
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BT @ jguimpel @ |
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790 |
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Arce, R.; Civale, L.; Luzuriaga, J.; Guimpel, J.; de la Cruz, F. |
| Title |
Surface normal regions in superconducting Zr70Cu30 induced by thermal relaxation |
Type |
Journal Article |
| Year |
1983 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
48 |
Issue |
12 |
Pages |
1027-1030 |
| Keywords |
ZIRCONIUM COPPER ALLOYS – Physical Properties; SUPERCONDUCTING MATERIALS |
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Penetration depth measurements show that thermal heat treatment in amorphous Zr70Cu30 induces a normal region 5000 Å thick at the surface of ultrarapid quenched ribbons. Upper critical field measurements indicate that the new induced phase is a normal one while the rest of the sample remains as a homogeneous superconducting phase. |
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Centro Atómico Bariloche – Instituto Balseiro |
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00381098 (ISSN) |
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Export Date: 28 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Arce, R.; Centro At |
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BT @ luzuriag @ |
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502 |
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Arce, R.; de la Cruz, F.; Guimpel, J. |
| Title |
Superconducting behavior of amorphous Zr70Cu30 |
Type |
Journal Article |
| Year |
1983 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
47 |
Issue |
11 |
Pages |
885-887 |
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Measurement of the Meissner penetration depth, λ(T) were made in amorphous Zr70Cu30 samples. The results indicate that this amorphous alloy behaves as a BCS superconductor with 2Δ(0)+45 degree rulekTc = 3.8, where Δ(0) is the superconducting energy gap at T=0 and Tc the critical temperature. It is also concluded that the low energy excitation, TLS, characteristics of amorphous material does not contribute to Tc. |
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Centro Atómico Bariloche – Instituto Balseiro |
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0038-1098 |
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BT @ pedrazp @ |
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532 |
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Bahrs, S.; Guimpel, J.; Goni, A.R.; Maiorov, B.; Fainstein, A.; Nieva, G.; Thomsen, C. |
| Title |
Persistent photo-excitation in GdBa2Cu3O6.5 in a simultaneous Raman and electrical-transport experiment |
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Journal Article |
| Year |
2005 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
72 |
Issue |
14 |
Pages |
144501 |
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We investigate the connection between persistent illumination-induced effects in underdoped RBa2Cu3O7-delta known as persistent photoconductivity and Raman bleaching. Despite the long-standing assumption that the electrical and optical properties respond to the same light-induced change in the material, they have not been directly compared until now. We present a simultaneous experiment of Raman spectroscopy and electrical transport under visible illumination at low temperatures. The time dependence of the response in the two methods differs by two orders of magnitude, showing that the effects are connected but not identical. We discuss our results within the oxygen-vacancy reordering model of photobleaching and find that different Cu-O chain lengths affect the optical and the electrical response differently. Raman bleaching and persistent photoconductivity thus provide a different perspective on the microscopic oxygen vacancy distribution. |
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1098-0121 |
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ISI:000232934100060 |
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BT @ hernan @ |
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204 |
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Blanco, M.C.; Paz, S.A.; Nassif, V.M.; Guimpel, J.J.; Carbonio, R.E. |
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Synthesis and characterization of the new two-dimensional Heisenberg antiferromagnet double perovskite BaLaCuSbO<inf>6</inf> |
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Journal Article |
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2015 |
Publication |
Materials Letters |
Abbreviated Journal |
Dalton Transactions |
| Volume |
44 |
Issue |
23 |
Pages |
10860-10866 |
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Cited By :3; Export Date: 14 March 2018 |
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BT @ jguimpel @ |
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788 |
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