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Correa, V.F.; Herbsommer, J.A.; Kaul, E.E.; de la Cruz, F.; Nieva, G. |
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Title |
Onset of the 0-dimensional vortex pinning behavior in the optimally doped and overdoped Bi2Sr2CaCu2O8+delta system |
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Journal Article |
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2000 |
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PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
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341 |
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1285-1286 |
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We report results of transverse AC magnetic permeability in the linear regime and DC magnetization loops for optimally doped and oxygen overdoped samples of Bi2Sr2CaCu2O8+delta The data cover the low temperature (T < 25K) and low held (H-a < 1000 Oe) region of the magnetic (H-a-T) phase diagram. In optimally doped as well as in overdoped samples a crossover to a O-dimensional pinning regime (Larkin length, L-C(C), shorter than the inter-plane CuO2 distance) is observed at a characteristic temperature Too for all investigated fields. The order-disorder transition, identified by the second peak in magnetization and a non monotonous field dependence of the AC penetration depth, is quenched below T-0D. |
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0921-4534 |
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ISI:000165855700242 |
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BT @ hernan @ |
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221 |
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Grigera, S.A.; Grigera, T.S.; Righi, E.F.; Nieva, G.; de la Cruz, F. |
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Title |
Flux-cutting in YBa2Cu3O7-delta revisited |
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Journal Article |
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2002 |
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PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
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371 |
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3 |
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237-242 |
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In this paper we present an analysis of the response of the vortices in YBa2Cu3O7-delta to different configurations of applied driving forces. The use of inhomogeneous current allows us to induce vortex cutting. We determine the maximum current injected in different electrical contact distributions which preserves vortex integrity, and we show that vortex cutting cannot be explained by a single vortex picture. (C) 2001 Elsevier Science B.V. All rights reserved. |
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0921-4534 |
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ISI:000176131500007 |
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BT @ hernan @ |
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212 |
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Haberkorn, N.; Guimpel, J.; Sirena, M.; Steren, L.B.; Campillo, G.; Saldarriaga, W.; Gomez, M.E. |
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Interface disorder and transport properties in HTC/CMR superlattices |
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Journal Article |
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2004 |
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PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
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408 |
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896-897 |
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The physical properties of superlattices are affected by interface disorder, like roughness and interdiffusion. X-ray diffraction allows its measurement through modeling and structure refinement. The high-T-c RBa2Cu3O7 (RBCO) and colossal magneto resistance La(x)A(1-x)MnO(3) (LAMO) perovskites are interesting superlattice partners given their similar lattice parameters and because the combination of magnetic and superconducting properties is interesting for both basic and applied research. We have investigated the structural and transport properties of YBCO/La2/3Ca1/3MnO3 and GdBCO/La0.6Sr0.04MnO3 superlattices grown by sputtering on (100)MgO. We find a roughness of 1 RBCO unit cell and a 30% interdiffusion in the same length from the interfaces for all samples. The superconducting behavior is found strongly dependent on the LAMO layer thickness. (C) 2004 Elsevier B.V. All rights reserved. |
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0921-4534 |
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ISI:000224051700375 |
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BT @ hernan @ |
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160 |
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Bridoux, G.; Pedrazzini, P.; de la Cruz, F.; Nieva, G. |
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Title |
Angular field dependence of the Nernst effect in Bi2Sr2CaCu2O8+delta |
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Journal Article |
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2007 |
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PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
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460 |
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841-842 |
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The anomalous Nernst effect in hole-doped cuprates has been interpreted in terms of the existence of a superconducting order parameter well above the transition temperature, T-c(H). In order to improve the understanding of this problem, we have measured the angular field dependence of the Nernst signal in Bi2Sr2CaCu2O8+delta single crystals. The experiment was done tilting the magnetic field with respect to the direction of the temperature gradient, above and below T,(H), with applied fields up to 16 T. We have found that all the curves are scaled on one curve against the reduced field Hcos theta at a fixed temperature. (c) 2007 Elsevier B.V. All rights reserved. |
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0921-4534 |
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ISI:000249870600060 |
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BT @ hernan @ |
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198 |
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Luccas, R.F.; Haberkorn, N.; Guimpel, J.; Bridoux, G.; Nieva, G. |
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Title |
Growth of GdBa2Cu3O7 thin films on single crystalline substrates of Y1-xPrBa2Cu3O7 |
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Journal Article |
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2007 |
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PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
Abbreviated Journal |
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460 |
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1377-1378 |
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Superconducting GdBa2CU3O7 thin films were grown by dc magnetron sputtering on Y1-xPrxBa2CU3O7 superconducting bulk single crystals. We optimized the in plane lattice matching with the Pr concentration. The samples were characterized by X-ray diffraction and electrical transport experiments. Magnetization hysteresis loops show high values of the critical currents for the films. (c) 2007 Elsevier B.V. All rights reserved. |
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0921-4534 |
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ISI:000249870600314 |
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BT @ hernan @ |
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150 |
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