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Author |
Favaron, J.; de la Cruz, M.E.; Esquinazi, P.; de la Cruz, F. |
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Title |
Phase diagram and superconductive properties of splat-cooled CuxLa1-x |
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Journal Article |
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Year |
1980 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
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Volume  |
21 |
Issue |
7 |
Pages |
2804-2808 |
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The phase diagram of nonequilibrium, splat-cooled CuxLa1-x is interpreted by means of superconductive-transition and x-ray measurements. At the eutectic composition the material is shown to be in a highly disordered state. Measurements of dc resistance and ac susceptibility show that there are two different critical fields at the disordered concentration although there is a unique critical temperature. |
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American Physical Society |
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BT @ pedrazp @ PhysRevB.21.2804 |
Serial |
535 |
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Author |
de la Cruz, F.; Fink, H.J.; Luzuriaga, J. |
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Title |
Temperature dependence of the superconducting giant-vortex state. Theory and Experiment |
Type |
Journal Article |
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Year |
1979 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
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Volume |
20 |
Issue |
5 |
Pages |
1947-1959 |
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When a type-I superconductor with a surface nucleation field Hc3(T)>Hc(T) (thermodynamic critical field) is thermally cycled in an axially applied magnetic field H0 between the temperatures T(Hc3) and about T(Hc), experiments show that the magnetization changes reversibly. The latter is diamagnetic near T(Hc3) but can be paramagnetic just above T(Hc). This behavior is explained by assuming that the fluxoid quantum number b is fixed at the transition from the normal to the superconducting state and retained at lower temperatures. The value of b is determined almost entirely by the flux at the transition which is enclosed by a contour located at a distance ξ1.7 from the surface inside the cylinder (ξ is the coherence length). The temperature variation of the order parameter f at the surface of the cylinder, the magnetization m, and the temperature at which m=0 for f≠0 are calculated for R>>ξ. Conservation of the fluxoid quantum number, while T is varied causes the two opposing surface currents to become imbalanced. This is the source of the observed para- and diamagnetism. |
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0163-1829 |
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ISI:A1979HP51300019 |
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Call Number |
BT @ hernan @ |
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275 |
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Author |
de la Cruz, M.E.; Godfrin, E.J.P.; de la Cruz, F.; de Allende, C. |
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Title |
Superconducting intermediate state in cadmium |
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Journal Article |
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Year |
1976 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
18 |
Issue |
6 |
Pages |
747-749 |
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Perpendicular magnetic critical fields for cadmium foils were measured to thicknesses below the temperature dependent coherence length. The presence of supercooling indicates first-order thermodynamic transitions for all samples. A modification of Davies' model leads to a good fit of the experimental data. |
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0038-1098 |
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BT @ pedrazp @ |
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528 |
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Author |
Kaufman, H.L.; de la Cruz, F. |
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Title |
Fluctuation induced diamagnetism in aluminum |
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Journal Article |
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Year |
1971 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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Volume |
9 |
Issue |
20 |
Pages |
1729-1732 |
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The magnetic field and temperature dependence of the magnetization of bulk aluminum near the normal-superconductor transition has been measured. Due to the large amount of supercooling in one of the samples it was possible to extend the measurements well below the critical temperature. A comparison of the experimental results with theory is presented.
Résumé
Nous avons mesuré la dépendance en champ magnétique et en température de la magnétisation d'un échantillon massif d'aluminium au voisinage de la transition état normal-état supraconducteur. Grâce au ‘supercooling’ important d'un des échantillon, nous avons pu étendre nos mesures bien au dessous de la température critique. Nous comparons les résultats expérimentaux à la théorie. |
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0038-1098 |
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BT @ pedrazp @ |
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803 |
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Author |
Bressan, O.J.; Ridner, A.E.; de la Cruz, F. |
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Title |
T^5 law and Matthiessen's rule |
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Journal Article |
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Year |
1975 |
Publication |
Journal of Physics F: Metal Physics |
Abbreviated Journal |
J. Phys. F: Met. Phys. |
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Volume |
5 |
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3 |
Pages |
481 |
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Precise electrical resistivity measurements on very dilute non magnetic indium alloys show no doubt in a T 5 dependence on temperature between 1-4K and strong deviations from Matthiessen rule. Measurements of thermal resistivity show that the extrapolation method to obtain the data to H=0 is correct. Comparison of the results with recent theories is discussed. |
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0305-4608 |
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no |
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BT @ pedrazp @ |
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547 |
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Author |
Bressan, O.J.; Ridner, A.E.; de la Cruz, F. |
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Title |
Low angle electron scattering in thermal resistivity |
Type |
Journal Article |
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Year |
1975 |
Publication |
Journal of Physics F: Metal Physics |
Abbreviated Journal |
J. Phys. F: Met. Phys. |
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5 |
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1902-1909 |
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Electrical ( rho ) and thermal (W) resistivity measurements in very dilute In alloys between 1K and 4K show a temperature dependence expressed by rho = rho 0+ beta T5 and WT=(WT)0+AT3+BT5. The BT5 term in the thermal resistivity is due to a contribution from a 'diffusion-like process' of electrons over the Fermi surface, as is the one that describes the temperature dependence of the electrical resistivity. This claim is supported by the experimental fact that the Lorenz number defined as L= beta /B coincides with the value given by L= rho 0/(WT)0 which in turn agrees with the free electron value within 15%. |
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BT @ pedrazp @ |
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550 |
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Author |
Maloney, M.D.; de la Cruz, F.; Cardona, M. |
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Title |
Superconducting Parameters and Size Effects of Aluminum Films and Foils |
Type |
Journal Article |
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Year |
1972 |
Publication |
Physical Review B |
Abbreviated Journal |
Prb |
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Volume |
5 |
Issue |
9 |
Pages |
3558-3572 |
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American Physical Society |
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BT @ pedrazp @ 10.1103/PhysRevB.5.3558 |
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804 |
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Author |
Guimpel, J.; Monton, C.; Haberkorn, N.; de la Cruz, F. |
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Title |
Magnetic behaviour of superconductor/ferromagnet metallic and perovskite based superlattices |
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Journal Article |
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2007 |
Publication |
physica status solidi (c) |
Abbreviated Journal |
Phys. Status Solidi (c) |
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Volume |
4 |
Issue |
11 |
Pages |
4174-4180 |
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Keywords |
74.45.+c; 74.78.Fk; 75.70.Cn |
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Abstract |
We present a study of the magnetic behaviour of superconducting/ferromagnetic superlattices, both for metallic and perovskite based systems. In the first case we find that the response is determined by the ferromagnetic layer regime. If these layers are very thin, no ferromagnetism is observed, but the superconducting layers are decoupled, and the superlattice behaves as a stack of independent superconducting films. For thicker ferromagnetic films, ferromagnetism is established and the effective field resulting from the superposition of stray and applied fields dominates the superconducting response of the superlattice. For the perovskite based superlattices, the physical properties are more affected by interface disorder. In this case we have found that the behaviour can be interpeted as charge carrier transfer between both materials, inducing a change in the magnetic character of the manganite. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) |
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WILEY-VCH Verlag |
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1610-1642 |
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BT @ jguimpel @ |
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620 |
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Author |
Civale, L.; Safar, H.; de la Cruz, F. |
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Title |
Percolation and glass behavior in ceramic superconductors: oxygen effects |
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1989 |
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Modern Physics Letters B |
Abbreviated Journal |
Mod. Phys. Lett. B |
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3 |
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2 |
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173-181 |
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It is shown that small variations of oxygen content in La1.8Sr0.2CuO4−δ can be used to control the reversible and irreversible magnetization temperature dependence of the superconducting state. A grain bond model is appropriate to describe the superconducting response of the ceramics. The study of the temperature dependence of the magnetization and the resistive transition temperature, in a slightly deoxygenated sample, show that the reversible superconducting state is strongly correlated to superconducting percolation. Deoxygenation has been shown to be an excellent technique to study the time evolution of metastable states induced by currents in the bonds and or in the grains. It is shown that superconducting grains are not correlated to ceramic grains. |
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BT @ pedrazp @ |
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802 |
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Author |
de la Cruz, F.; Maloney, M.D.; Cardona, M. |
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Title |
Superconductive Supercooling and Superheating of Small Cadmium Spheres: Size Effects |
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Journal Article |
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Year |
1971 |
Publication |
Physical Review B |
Abbreviated Journal |
Prb |
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Volume |
3 |
Issue |
11 |
Pages |
3802-3811 |
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American Physical Society |
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BT @ pedrazp @ 10.1103/PhysRevB.3.3802 |
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806 |
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