| 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 |
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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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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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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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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 |
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179 |
Issue |
1-2 |
Pages |
15-20 |
| Keywords |
Chalcogenide; Vortex pinning; Correlated defects; Electrical transport; Fe deficiency |
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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. |
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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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Amigó, M.L.; Haberkorn, N.; Pérez, P.; Suárez, S.; Nieva, G. |
| Title |
Vortex dynamics in β -FeSe single crystals: effects of proton irradiation and small inhomogeneous stress |
Type |
Journal Article |
| Year |
2017 |
Publication |
Superconductor Science and Technology |
Abbreviated Journal |
Supercond. Sci. Technol. |
| Volume |
30 |
Issue |
12 |
Pages |
125017 |
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We report on the critical current density J c and the vortex dynamics of pristine and 3 MeV proton irradiated (cumulative dose equal to ##IMG## [http://ej.iop.org/images/0953-2048/30/12/125017/sustaa9518ieqn1.gif] {$2\times {10}^{16}$} cm −2 ) β -FeSe single crystals. We also analyze a remarkable dependence of the superconducting critical temperature T c , J c and the flux creep rate S on the sample mounting method. Free-standing crystals present T c = 8.4(1) K, which increases to 10.5(1) K when they are fixed to the sample holder by embedding them with GE-7031 varnish. On the other hand, the irradiation has a marginal effect on T c . The pinning scenario can be ascribed to twin boundaries and random point defects. We find that the main effect of irradiation is to increase the density of random point defects, while the embedding mainly reduces the density of twin boundaries. Pristine and irradiated crystals present two outstanding features in the temperature dependence of the flux creep rate: ##IMG## [http://ej.iop.org/images/0953-2048/30/12/125017/sustaa9518ieqn2.gif] {$S(T)$} presents large values at low temperatures, which can be attributed to small pinning energies, and a plateau at intermediate temperatures, which can be associated with glassy relaxation. From Maley analysis, we observe that the characteristic glassy exponent μ changes from ∼1.7 to 1.35–1.4 after proton irradiation. |
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0953-2048 |
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BT @ pedrazp @ |
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770 |
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Amigó, M.L.; Herrera, T.; Neñer, L.; Peralta Gavensky, L.; Turco, F.; Luzuriaga, J. |
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A quantitative experiment on the fountain effect in superfluid helium |
Type |
Journal Article |
| Year |
2017 |
Publication |
European Journal of Physics |
Abbreviated Journal |
Eur. J. Phys. |
| Volume |
38 |
Issue |
5 |
Pages |
055103 |
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| Abstract |
Superfluid helium, a state of matter existing at low temperatures, shows many remarkable properties. One example is the so called fountain effect, where a heater can produce a jet of helium. This converts heat into mechanical motion; a machine with no moving parts, but working only below 2 K. Allen and Jones first demonstrated the effect in 1938, but their work was basically qualitative. We now present data of a quantitative version of the experiment. We have measured the heat supplied, the temperature and the height of the jet produced. We also develop equations, based on the two-fluid model of superfluid helium, that give a satisfactory fit to the data. The experiment has been performed by advanced undergraduate students in our home institution, and illustrates in a vivid way some of the striking properties of the superfluid state. |
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0143-0807 |
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BT @ pedrazp @ |
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780 |
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