| 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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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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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 |
Type |
Journal Article |
| Year |
2017 |
Publication |
Superconductor Science and Technology |
Abbreviated Journal |
Supercond. Sci. Technol. |
| Volume |
30 |
Issue |
8 |
Pages |
085010 |
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| Abstract |
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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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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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 @ |
Serial |
847 |
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