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| Author | Guimpel, J.; Haberkorn, N.; Sirena, M.; Steren, L.B.; Saldarriaga, W.; Baca, E.; Gomez, M.E. | ||||
| Title | Interface effects in perovskite superlattices | Type | Journal Article | ||
| Year | 2004 | Publication | JOURNAL OF LOW TEMPERATURE PHYSICS | Abbreviated Journal | |
| Volume | 135 | Issue | 1-2 | Pages | 115-118 |
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| Abstract | The effect of interface disorder in perovskite superlattices, either with the substrate or between layers dominates the physics of the material, even when the lattice parameter of the component materials differs in less than 1%. Unexpected behavior emerges, like exchange bias in a system where no antiferromagnetic material has been included in the superlattice design. | ||||
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| ISSN | 0022-2291 | ISBN | Medium | ||
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| Notes | ISI:000189139000012 | Approved | no | ||
| Call Number | BT @ hernan @ | Serial | 166 | ||
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| Author | Maiorov, B.; Osquiguil, E. | ||||
| Title | Bose-glass-like phases in oriented-twin YBa2Cu3O7-? crystals | Type | Journal Article | ||
| Year | 2004 | Publication | Journal of Low Temperature Physics | Abbreviated Journal | J. Low Temp. Phys. |
| Volume | 135 | Issue | 1-2 | Pages | 131-134 |
| Keywords | Low temperature effects; Magnetic fields; Superconducting materials; Bose-glass phases; Planar random defect array; Yttrium barium copper oxides; physics | ||||
| Abstract | We experimentally study the dynamical response of the superconducting vortex system near the solid-liquid transition by applying forces parallel and perpendicular to a planar random defect array. Our results show that for magnetic fields above a certain critical field Hcr'? 4 T the solid glassy vortex phase in YBa2Cu3O7-? crystals with oriented twin planes does not correspond to the so-called Bose-glass phase. | ||||
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| ISSN | 00222291 (ISSN) | ISBN | Medium | ||
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| Notes | Cited By (since 1996): 1; Export Date: 17 April 2009; Source: Scopus; CODEN: JLTPA; Language of Original Document: English; Correspondence Address: Maiorov, B.; Superconductivity Technology Center; Los Alamos Laboratory Los Alamos, NM 87545, United States; References: Crabtree, G., Nelson, D.R., (1997) Phys. Today, 50, p. 38. , and references therein; Nelson, D.R., Vinokur, V.M., (1993) Phys. Rev. Lett., 68, p. 2398. , J. Lidmar and M. Wallin, Europhys. Lett. 47, 494 (1999); Grigera, S.A., (1998) Phys. Rev. Lett., 81, p. 2348; Maiorov, B., Osquiguil, E., (2001) Phys. Rev. B, 64, p. 052511; Maiorov, B., Nieva, G., Osquiguil, E., (2000) Phys. Rev. B., 61, p. 12427; Grigera, S.A., (2001) Phys. Rev. B., 63, p. 212509 | Approved | no | ||
| Call Number | BT @ osquigui @ | Serial | 367 | ||
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| Author | Cruz, F. de la; Fasano, Y.; Seta, M.D.; Menghini, M.; Pastoriza, H. | ||||
| Title | Plastic and Elastic Symmetry Transformations Induced in the Vortex Lattice of Anisotropic and Layered Superconductors | Type | Journal Article | ||
| Year | 2004 | Publication | Journal of Low Temperature Physics | Abbreviated Journal | |
| Volume | 135 | Issue | Pages | 99-110 | |
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| Abstract | We make a comparative analysis of the response of the three-dimensional vortex lattice in Bi$2$Sr$2$CaCu$2Ο8$ and NbSe$2$ to the presence of square arrays of pinning sites localized at one extremity of the vortex crystals. The absence of the hexagonal to square symmetry transformation and the induction of a distorted hexagonal symmetry in the vortex lattice of NbSe$2$ contrast to the observed symmetry change in Bi$2$Sr$2$CaCu$2Ο8$. The dissimilar response in both cases is explained taking into account the vortex structure solidification mechanisms in both materials: The plastic response in the case of the layered material Bi$2$Sr$2$CaCu$2Ο8$ is suggested to be a result of the simultaneity of solidification and coupling of bidimensional pancake vortices whereas a viscous solidification is the responsible for the three-dimensional elastic response in NbSe$_2$. | ||||
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| Call Number | BT @ hernan @ delacruz04 | Serial | 15 | ||
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| Author | Hernandez,A.; Ares,O.; Hart, C.; Domínguez,D.; Pastoriza,H.; Butera, A. | ||||
| Title | Dissipation in mesoscopic superconductors with ac magnetic fields | Type | Journal Article | ||
| Year | 2004 | Publication | Journal of Low Temperature Physics | Abbreviated Journal | |
| Volume | 135 | Issue | Pages | 119-122 | |
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| Abstract | The response of mesoscopic superconductors to an ac magnetic field is investigated both experimentally and with numerical simulations. We study small square samples with dimensions of the order of the penetration depth. We obtain the ac susceptibitity $\chi=\chi'+\chi“$ at microwave frequencies as a function of the dc magnetic field $H{dc}$. We find that the dissipation, given by $\chi”$, has a non monotonous behavior in mesoscopic samples. In the numerical simulations we obtain that the dissipation increases before the penetration of vortices and then it decreases abruptly after vortices have entered, the sample. This is verified experimentally, where we find that $\chi"$ has strong oscillations as a function of $H{dc}$ in small squares of Pb |
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| Call Number | BT @ hernan @ hernandez04 | Serial | 24 | ||
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| Author | Marconi V. I.; Pastoriza, H.; Domínguez, D. | ||||
| Title | Transverse voltage in disordered Josephson junction arrays with diagonal bias | Type | Journal Article | ||
| Year | 2004 | Publication | Journal of Low Temperature Physics | Abbreviated Journal | |
| Volume | 135 | Issue | Pages | 135-138 | |
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| Abstract | We study numerically the effect of disorder in the transport properties of square Josephson junction arrays with a dc current applied in the diagonal direction ([11] direction). We obtain a finite transverse voltage in this case when we consider the presence of disorder in the critical currents of the junctions. We show that this behavior is in good agreement with previous experimental, results in square arrays with a diagonal current drive. | ||||
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| Call Number | BT @ hernan @ marconi04 | Serial | 27 | ||
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| Author | Shalóm, D. E.; Pastoriza, H. | ||||
| Title | Experimental Method to Measure Anisotropic Transport in 2D Superconductors | Type | Journal Article | ||
| Year | 2004 | Publication | Journal of Low Temperature Physics | Abbreviated Journal | |
| Volume | 135 | Issue | Pages | 153-156 | |
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| Abstract | A two-coil kinetic inductance technique for measuring anisotropic response in two-dimensional (2D) superconductors is presented. Serpentine-shaped coils are lithographically patterned directly on top of the sample, separated by isolation layers. The drive and receive coils are positioned in a way that enhances signal from longitudinal currents and reduces transversal ones, maximizing the ratio. Anisotropic transport can be directly measured with this technique, even when anisotropy is induced by the transport current. | ||||
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| Call Number | BT @ hernan @ shalom04a | Serial | 43 | ||
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| Author | Sereni, J.G. | ||||
| Title | Peculiar thermal features of Ce-systems around their critical points | Type | Journal Article | ||
| Year | 2007 | Publication | JOURNAL OF LOW TEMPERATURE PHYSICS | Abbreviated Journal | |
| Volume | 147 | Issue | 3-4 | Pages | 179-197 |
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| Abstract | Some non-predicted thermal behavior observed in various Ce-lattice compounds close to their critical points are presented. From a comparison between phase diagrams driven by doping (x) and pressure, a pre-critical region (x* < x < x(cr)) is identified in the former group. Some systematic behaviors, observed in the specific heat (C-m/T) and the entropy gain, are recognized as characteristic features of that region. Different measured temperature dependencies of C-m/T are compared, detecting that the onset of the non-Fermi-liquid behavior occurs much closer to x* than x(cr). In a detailed analysis of the evolution of the thermal dependence within the pre-critical region, a further change in the T dependence is frequently observed before to reach the critical point. A generalized power law function is proposed to compare different systems, which allows to identify a low temperature C-m/T(T) anomaly that only involves about 0.01 x R ln 2 of entropy. | ||||
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| ISSN | 0022-2291 | ISBN | Medium | ||
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| Notes | ISI:000245133000008 | Approved | no | ||
| Call Number | BT @ hernan @ | Serial | 52 | ||
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| Author | Pedrazzini, P.; Berisso, M.G.; Trovarelli, O.; Sereni, J.G.; Geibel, C. | ||||
| Title | Evolution of the ground state in the ternary system CeT2Si2 (T=Cu, Rh and Pd) | Type | Journal Article | ||
| Year | 2004 | Publication | Journal of Low Temperature Physics | Abbreviated Journal | J. Low Temp. Phys. |
| Volume | 135 | Issue | 1-2 | Pages | 143-146 |
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| Abstract | The heavy fermion compounds CeCu2Si2, CeRh2Si2 and CePd2Si2 have been intensively investigated due to the non-conventional relation between superconductivity and magnetism. We have studied these compounds as constituents of a ternary system, where the Ce(RhxCu1-x)(2)Si-2, Ce(PdyRh1-y)(2)Si-2 and Ce(CuzPd1-z)(2)Si-2 alloys span the sides of a triangle with the respective stoichometric compounds at each vertex. In this article we discuss the evolution of the ground state throughout this ternary system, and we analyse (by means of the electrical resistivity) the influence of doping-induced disorder on the Kondo and magnetic ordering temperatures. | ||||
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| ISSN | 0022-2291 | ISBN | Medium | ||
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| Notes | ISI:000189139000019 | Approved | no | ||
| Call Number | BT @ hernan @ | Serial | 66 | ||
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| Author | Trovarelli, O.; Sereni, J.G.; Kappler, J.P. | ||||
| Title | Role of Ce sublattices in the thermal and magnetic properties of Ce7X3 (X=Ni, Ru, Rh, Ir, Pd, and Pt) compounds | Type | Journal Article | ||
| Year | 1997 | Publication | Journal of Low Temperature Physics | Abbreviated Journal | J. Low. Temp. Phys. |
| Volume | 108 | Issue | 1-2 | Pages | 53-85 |
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| Abstract | The role of the Ce sublattices in the thermal and magnetic properties of the Ce7X3 (X = Ni, Ru, Rh, Ir, Pd, and Pt) family of compounds is studied by means of ac and dc magnetic susceptibility, mngnetization and mainly specific-heat experiments in applied magnetic field. The experimental data show that in these compounds there is coexistence of magnetic order, heavy-fermion and intermediate-valence behavior, which is interpreted in terms of the contribution of the three different sublattices present in the crystalline structure of Th7Fe3-type (denoted by 1Ce(I), 3Ce(II) and 3Ce(III)). From the available volume of the Ce-III atoms in their crystallographic environment it is found that sublattice Ce-III has an intermediate-valence behavior, whereas from entropic considerations sublattices Ce-I and Ce-II are identified as responsible for the magnetic order or heavy-fermion behavior, depending on the Ce-ligand electronic structure. This systematics evidences a clear correlation between the thermal and magnetic properties of these compounds and the position of the respective Ce-ligands in the periodic table, through the particular sensitivity of Ce to the environmental conditions. | ||||
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| ISSN | 0022-2291 | ISBN | Medium | ||
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| Notes | ISI:A1997XK19200004 | Approved | no | ||
| Call Number | BT @ hernan @ | Serial | 92 | ||
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| Author | Sereni, J.G.; Huber, J.G.; Luengo, C.A.; Maple, M.B. | ||||
| Title | Calorimetric study of the magnetization of Ce impurities in superconducting Th-Y and Th-Sc alloys | Type | Journal Article | ||
| Year | 1978 | Publication | Journal of Low Temperature Physics | Abbreviated Journal | J. Low Temp. Phys. |
| Volume | 30 | Issue | 5-6 | Pages | 729-737 |
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| Abstract | Specific heat measurements are reported in detail for the Ce impurity in the superconducting matrix systems Th65Sc35Ce, Th80Y20Ce, and Th65Y35Ce. The variation of the specific heat jump DeltaC at the superconducting transition temperature T c is indicative of the magnetic nature of an impurity. For Th65Y35Ce a departure is found from the BCS law of corresponding states predicted for a nonmagnetic impurity. This departure is correlated with that observed for (La, Th)Ce systems and related to DeltaT c/n (initial slope of T c vs. n) and Ce effective size (implied by lattice parameter data). | ||||
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| ISSN | 0022-2291 | ISBN | Medium | ||
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| Notes | ISI:A1978EW47300012 | Approved | no | ||
| Call Number | BT @ hernan @ | Serial | 140 | ||
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