toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Records Links
Author (up) Affolter, J.; Tesei, M.; Pastoriza, H.; Leemann, C.; Martinoli, P. doi  openurl
  Title Observation of Ising-like critical fluctuations in frustrated Josephson junction arrays with modulated coupling energies Type Journal Article
  Year 2002 Publication Physica C Abbreviated Journal  
  Volume 369 Issue Pages 313-316  
  Keywords  
  Abstract We report the results of ac sheet conductance measurements performed on fully frustrated square arrays of Josephson junctions whose coupling energy is periodically modulated in one of the principal lattice directions. Such systems are predicted to exhibit two distinct transitions: a low-temperature Ising-like transition triggered by the proliferation of domain walls and a high-temperature transition driven by the vortex unbinding mechanism of the Beresinskii-Kosterlitz-Thouless (BKT) theory. Both the superfluid and dissipative components of the conductance are found to exhibit features which unambiguously demonstrate the existence of a double transition whose properties are consistent with the Ising-BKT scenario.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ affolter02 Serial 1  
Permanent link to this record
 

 
Author (up) André, M-O.; Polichetti, M.; Pastoriza, H.; Kes, P. H. doi  openurl
  Title Vortex dynamics in 2H-NbSe$_2$ containing a periodic channel structure Type Journal Article
  Year 2000 Publication Physica C Abbreviated Journal  
  Volume 338 Issue Pages 179-188  
  Keywords  
  Abstract We have measured the resistivity and magnetic AC susceptibility of 2H-NbSe single crystals containing alternating 2 stripes of irradiated and non-irradiated regions of columnar defects created by heavy-ion bombardment. Without applied magnetic field, the sample undergoes a double-step transition into the superconducting state, each step corresponding to the transitions in the irradiated and non-irradiated regions, respectively. For fields smaller than half of the matching field and upon increasing the temperature, the onset of flux motion in the non-irradiated channels occurs, when the applied stress due to the electrical current equals the shear stress at the channel edges, while depinning in the irradiated stripes occurs at higher temperature. The weak amplitude dependence of the shear process suggests that it takes place at the melting transition. We observed only a single-step transition at DC magnetic fields larger than half the matching field, because pinning by the columnar defects in the irradiated stripes is much less effective, and consequently the shear stress at the channel edges is strongly reduced. The comparison between the shear stress deduced from I curves and the theoretical value $?max = AC66$ yields a value for the constant Α, which is in good agreement with theoretical predictions.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ andre99 Serial 2  
Permanent link to this record
 

 
Author (up) Bridoux, G.; Pedrazzini, P.; de la Cruz, F.; Nieva, G. openurl 
  Title Angular field dependence of the Nernst effect in Bi2Sr2CaCu2O8+delta Type Journal Article
  Year 2007 Publication PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS Abbreviated Journal  
  Volume 460 Issue Pages 841-842  
  Keywords  
  Abstract 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.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0921-4534 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000249870600060 Approved no  
  Call Number BT @ hernan @ Serial 198  
Permanent link to this record
 

 
Author (up) Bud'ko, S.L.; Nakamura, O.; Guimpel, J.; Maple, M.; Schuller, I.K. url  openurl
  Title Anisotropic pressure dependence of the critical temperature of REBa2Cu3O7−δ Type Journal Article
  Year 1991 Publication Physica C: Superconductivity Abbreviated Journal  
  Volume 185-189, Part 3 Issue Pages 1947-1948  
  Keywords  
  Abstract The hydrostatic pressure dependence of the superconducting critical temperature, Tc, was measured in highly crystalline oriented REBa2Cu3O7−δ (RE=Yb, Dy, Y, Gd) thin films grown on different substrates. The anisotropic strain field induced by the substrate and the different crystalline orientations of the films allows the three strain derivatives of the critical temperature to be estimated. A large anisotropy is found in the ab plane with Tc increasing on compression parallel to the CuO chains and decreasing on compression perpendicular to them. The results on c textured films indicate a non linear relation between Tc and the microscopic parameter which determines its pressure dependence.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0921-4534 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ jguimpel @ Serial 616  
Permanent link to this record
 

 
Author (up) Causa, M.T.; Dutrus, S.M.; Fainstein, C.; Nieva, G.; Sanchez, R.; Steren, L.B.; Tovar, M.; Zysler, R.; Oseroff, S.B.; Vier, D.C.; Schultz, S.; Fisk, Z.; Smith, J.L. openurl 
  Title Magnetic ordering in dilute GdxEu1−xBa2Cu3O7−δ superconductors Type Journal Article
  Year 1988 Publication Physica C: Superconductivity Abbreviated Journal Physica C  
  Volume 153 Issue Pages 188-189  
  Keywords  
  Abstract We have measured the specific heat of GdxEu1−xBa2Cu3O7−δ (0 ≤ × ≤ 1). The data show a λ-type anomaly at high concentrations and a broad Schottky type anomaly at intermediate and low concentrations. We compare this behavior with theoretical predictions for a 2-dimensional Ising system.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 432  
Permanent link to this record
 

 
Author (up) Chialvo, C.E.; Guimpel, J.; Pastoriza, H. openurl 
  Title Hall Effect in Superconductors with Periodic Pinning Arrays Type Journal Article
  Year 2005 Publication Physica C Abbreviated Journal  
  Volume 422 Issue 3-4 Pages 112-116  
  Keywords  
  Abstract We have studied the electrical resistivity and Hall effect in the dissipative regime of Nb films with periodic rectangular arrays of Ni and Co submicrometric dots. Samples with different orientations of the pinning arrays respect to the applied current direction where studied. The even parity in magnetic field of the Hall effect signals a guided motion of the vortices. Possible origins for the vortex channeling are discussed.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ chialvo05 Serial 7  
Permanent link to this record
 

 
Author (up) Civale, L.; Pasquini, G.; Levy, P.; Nieva, G.; Casa, D.; Lanza, H. openurl 
  Title Time relaxation of persistent currents in YBa2Cu3O7−x crystals with columnar defects Type Journal Article
  Year 1996 Publication Physica C: Superconductivity Abbreviated Journal Physica C  
  Volume 263 Issue 1-4 Pages 389-395  
  Keywords  
  Abstract We have measured the persistent currents and their time relaxation in YBa2Cu3O7−x single crystals with correlated disorder introduced by irradiation with high-energy heavy-ions. For vortex density lower than the defect density, and for applied fields either parallel or nonparallel to the columnar defects, we find clear evidence of a pinning-crossover between a regime of strong individual pinning at low temperatures and a regime of weaker collective pinning at high temperatures. We explore the vortex dynamics above and below this crossover.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ gnieva @ Serial 455  
Permanent link to this record
 

 
Author (up) Correa, V.F.; Herbsommer, J.A.; Kaul, E.E.; de la Cruz, F.; Nieva, G. openurl 
  Title Onset of the 0-dimensional vortex pinning behavior in the optimally doped and overdoped Bi2Sr2CaCu2O8+delta system Type Journal Article
  Year 2000 Publication PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS Abbreviated Journal  
  Volume 341 Issue Pages 1285-1286  
  Keywords  
  Abstract 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.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0921-4534 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000165855700242 Approved no  
  Call Number BT @ hernan @ Serial 221  
Permanent link to this record
 

 
Author (up) Correa, V.F.; Nieva, G.; Pastoriza, H.; de la Cruz, F. openurl 
  Title The true pinning force range in Bi2Sr2CaCu2O8 single crystals at low temperatures Type Journal Article
  Year 2004 Publication Physica C Abbreviated Journal  
  Volume 408-410 Issue Pages 531-532  
  Keywords  
  Abstract We study the effective profile of the pinning potential well in Bi$2$Sr$2$CaCu$_2$O8+δ single crystals using transverse ac magnetic susceptibility. The results show that the harmonic approximation for the potential well (linear regime) is valid up to vortex displacements $r\simeqξ$, where ξ, is the coherence length. In spite of this, it is necessary to induce displacements of the vortex structure much larger than ξ to depin it from its potential. This is shown to take place even in the single vortex limit.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ correa04 Serial 9  
Permanent link to this record
 

 
Author (up) D'Anna, G.; Andr url  openurl
  Title Flux-line response in 2H-NbSe2 investigated by means of the vibrating superconductor method Type Journal Article
  Year 1993 Publication Physica C: Superconductivity and its applications Abbreviated Journal Phys C Supercond Appl  
  Volume 218 Issue 1-2 Pages 238-244  
  Keywords Crystals; Defects; Electric currents; Electric losses; Hydrogenation; Niobium compounds; Phase diagrams; Thermal effects; Critical currents; Flux line response; Hydrogenated niobium selenide single crystals; Peak effect; Transverse AC losses; Vibrating superconductor method; Vortex pinning regime; Superconducting materials  
  Abstract We measure transverse AC losses in the low- and high-amplitude regime of 2H-NbSe2 single crystals using vibrating superconductor methods. The measurements are sensitive to small deviations of the critical state. The data constitute evidence for a peak effect of the critical current as a function of the temperature in this compound. We construct in the H-T phase diagram the “peak-effect” line which is supposed to mark an abrupt cross-over in the vortex-pinning regime.  
  Address AT and T Bell Laboratories, Murray Hill, NJ 07974, United States  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 09214534 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Cited By (since 1996): 13; Export Date: 28 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: D'Anna, G.; D Approved no  
  Call Number BT @ luzuriag @ Serial 521  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: