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Author (down) Esquinazi, P.; Luzuriaga, J.; Durán, C. url  doi
openurl 
  Title Vibrating-reed studies of flux pinning in the superconducting metallic glass Zr70Cu30 Type Journal Article
  Year 1988 Publication Physical Review B Abbreviated Journal  
  Volume 37 Issue 7 Pages 3689-3692  
  Keywords  
  Abstract With the vibrating-reed technique we have measured the resonance frequency and damping of superconducting ribbons of a Zr70Cu30 amorphous alloy as a function of magnetic field and temperature for different heat treatments of the same sample. Through these measurements we obtain the Labusch parameter in the reduced-field (b) range 5  
  Address Centro Atomico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina  
  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 01631829 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 28 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.37.3689; Language of Original Document: English; Correspondence Address: Esquinazi, P.; Centro Atomico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina Approved no  
  Call Number BT @ luzuriag @ Serial 495  
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Author (down) Esquinazi, P.; Luzuriaga, J. url  openurl
  Title Annealing effects on the sound velocity and internal friction in the superconducting and normal states of the Cu30Zr70 amorphous alloy Type Journal Article
  Year 1988 Publication Physical Review B Abbreviated Journal  
  Volume 37 Issue 13 Pages 7819-7831  
  Keywords Zr70Cu30  
  Abstract By means of the vibrating-reed technique we have measured the evolution upon low-temperature annealing of the internal friction Q-1 and sound velocity v of the Cu30Zr70 amorphous alloy between 0.1 and 10 K. With an applied magnetic field of 5.6 T we measured also the normal-state behavior of both properties. Upon annealing, the internal friction and the slope of the logarithmic temperature dependence of v in the superconducting state decrease, in agreement with the standard tunneling model. Our results indicate that with thermal treatments, the coupling constant between tunneling systems (TSs) and phonons decreases, and the density of states of the TS remains constant or decreases, at most 25%, in the fully relaxed state, which is in agreement with published specific-heat results in these materials. From our data we conclude that the coupling constant between the TS and phonons should be very sensitive to the relaxed state of the disordered structure. The sound-velocity behavior strongly indicates that relaxation processes up to 10 K involve the interaction with the TS. A well-defined change of slope in v at the superconducting critical temperature Tc is observed in the as-quenched and the first relaxed state, which cannot be explained with the standard tunneling model and the Korringa-like relaxation rate between the TS and electrons. Several features observed in the superconducting and normal states lead to the conclusion that the TS-electron interaction problem remains unsolved.  
  Address Centro Atómico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina  
  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 01631829 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Cited By (since 1996): 9; Export Date: 28 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.37.7819; Language of Original Document: English; Correspondence Address: Esquinazi, P.; Centro Atmico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina Approved no  
  Call Number BT @ luzuriag @ Serial 494  
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Author (down) Durán, C.; Esquinazi, P.; Luzuriaga, J.; Brandt, E.H. doi  openurl
  Title Bc1 of high-Tc La1.8Sr0.2CuO4 and amorphous Zr70Cu30 superconductors measured by a vibrating reed Type Journal Article
  Year 1987 Publication Physics Letters A Abbreviated Journal Phys. Lett. A  
  Volume 123 Issue 9 Pages 485-488  
  Keywords Zr70Cu30; ZIRCONIUM COPPER ALLOYS – Amorphous  
  Abstract The lower critical field Bc1 of the high-Tc superconductor La1.8Sr0.2CuO4 (Tc=40 K, Bcless-than-or-equals, slant7.7 mT) and of amorphous Zr70Cu30 (Tc=2.6K, Bc1less-than-or-equals, slant3.8 mT) is obtained from the resonance frequency ?/2? of a vibrating reed made of these materials. At applied magnetic fields Ba<Bc1, ?(Ba)=?i(Ba) as predicted for an ideally diamagnetic reed. Above Bc1 we observe a reversible linear law ?2??2inot, vert, similarB2a?B2c1. This allows a simple definition of Bc1 even in ceramic superconductors into which flux starts to penetrate at Bamuch less-thanBc1 due to their granular structure.  
  Address  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0375-9601 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:A1987K407100012 Approved no  
  Call Number BT @ hernan @ Serial 269  
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Author (down) De La Cruz, F.; Luzuriaga, J.; Martinez, E.N.; Osquiguil, E.J. url  openurl
  Title Current-voltage characteristics in collective pinning Type Journal Article
  Year 1987 Publication Physical Review B Abbreviated Journal  
  Volume 36 Issue 13 Pages 6850-6852  
  Keywords  
  Abstract The critical-current curves of amorphous samples which exhibit collective flux pinning have been analyzed, and it was found that the nonlinear part can be fitted by an expression of the form V(I)[(I-IK)/IK]. This form, which could be due to critical behavior, is consistent with an interpretation of the unpinning of vortices in the collective regime as a phase transition between the static flux-line lattice (FLL) and the FLL in steady-state movement as has been proposed by Fisher.  
  Address Centro Atomico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina  
  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 01631829 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.36.6850; Language of Original Document: English; Correspondence Address: De La Cruz, F.; Centro Atomico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina Approved no  
  Call Number BT @ osquigui @ Serial 417  
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Author (down) de la Cruz, F.; Fink, H.J.; Luzuriaga, J. url  doi
openurl 
  Title Temperature dependence of the superconducting giant-vortex state. Theory and Experiment Type Journal Article
  Year 1979 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 20 Issue 5 Pages 1947-1959  
  Keywords  
  Abstract 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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  ISSN 0163-1829 ISBN Medium  
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  Notes ISI:A1979HP51300019 Approved no  
  Call Number BT @ hernan @ Serial 275  
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Author (down) D'Anna, G.; Benoit, W.; Luzuriaga, J.; Berger, H. doi  openurl
  Title Dynamic and static mechanical measurements of flux-lattice softening and associated hysteretic depinning dissipation peak in YBa2Cu3Ox ceramic Type Journal Article
  Year 1990 Publication Europhysics Letters Abbreviated Journal Europhys. Lett.  
  Volume 13 Issue 5 Pages 465-471  
  Keywords  
  Abstract We have studied flux-lattice dissipation in YBa2Cu3Ox ceramic using a forced inverted torsional pendulum. Reversible restoring force variations during temperature sweep suggest that flux lines experience a “hard-soft” transition between 50 K and Tc. Measurements of internal friction and modulus change as a function of the applied stress show a typical depinning behaviour. This dissipation peak during the temperature sweep is understood as a hysteretic depinning in which the critical force depends upon the penetration depth.  
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  ISSN 0295-5075 ISBN Medium  
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  Notes ISI:A1990EG33100015 Approved no  
  Call Number BT @ hernan @ Serial 259  
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Author (down) D'Anna, G.; Andre, M.-O.; Benoit, W.; Rodriguez, E.; Rodriguez, D.S.; Luzuriaga, J.; Wasczak, J.V. doi  openurl
  Title Flux-line response in 2H-NbSe2 investigated by means of the vibrating superconductor method Type Journal Article
  Year 1993 Publication Physica C Abbreviated Journal Physica C  
  Volume 218 Issue 1-2 Pages 238-244  
  Keywords  
  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.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0921-4534 ISBN Medium  
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  Notes ISI:A1993MM29800033 Approved no  
  Call Number BT @ hernan @ Serial 253  
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Author (down) Conte, V.; Giordano, J.L.; Zarate, J.J.; Luzuriaga, J. url  openurl
  Title Superconducting Devices for Radioastronomy; First Steps in Chile: SNS-junction Fabrication Type Conference Article
  Year 2010 Publication Abbreviated Journal  
  Volume 1 Issue Pages 424-427  
  Keywords  
  Abstract We present results of the microfabrication of Josephson Junctions (JJs) of Superconductor-Normal-superconductor (SNS) type, as a first step in the acquisition of the know-how of superconducting devices applied to radioastronomy. A twojunction SQUID was built using a Nb/Al bilayer deposited on a Si wafer. The procedure needs only one mask and a single UV exposure (i.e., one photolithography step). We show the micrograph and the observed non linear characteristic I-V curve at 4K of the first device fabricated in the framework of ALMA Grant 31090010.  
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  Area Expedition Conference Twenty-First International Symposium on Space Terahertz Technology  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 736  
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Author (down) Civale, L.; de la Cruz, F.; Luzuriaga, J. url  doi
openurl 
  Title Critical temperature and density of states in amorphous Zr70Cu30 Type Journal Article
  Year 1983 Publication Solid State Communications Abbreviated Journal Solid State Commun.  
  Volume 48 Issue 4 Pages 389-391  
  Keywords ZIRCONIUM COPPER ALLOYS  
  Abstract By means of thermal heat treatment of amorphous Zr70Cu30 it is shown that the induced decrease in critical temperature is followed by a reduction in the electronic density of states of the same magnitude as that obtained by changing the Cu concentration. This result indicates that the density of states is the fundamental microscopic parameter determining the superconducting behavior.  
  Address Centro Atomico Bariloche  
  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 00381098 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Cited By (since 1996): 1; Export Date: 28 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Civale, L.; Centro At Approved no  
  Call Number BT @ luzuriag @ Serial 503  
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Author (down) Ceva, H.; Luzuriaga, J. url  doi
openurl 
  Title Correlations in the sand pile model: From the log-normal distribution to self-organized criticality Type Journal Article
  Year 1998 Publication Physics Letters A Abbreviated Journal Phys. Lett. A  
  Volume 250 Issue 4-6 Pages 275-280  
  Keywords  
  Abstract We have studied the approach of the Abelian sand pile model towards the stationary, self-organized criticality state. The uncorrelated limit is shown both numerically and by a simple analysis to follow the log-normal distribution. We introduce and evaluate several correlation functions to study the correlated region.  
  Address Ctro. Atom. Bariloche Inst. Balseiro, CNEA, UNC, 8400 Bariloche, Argentina  
  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 03759601 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Cited By (since 1996): 2; Export Date: 28 April 2009; Source: Scopus; CODEN: PYLAA; Language of Original Document: English; Correspondence Address: Ceva, H.; Departamento de F Approved no  
  Call Number BT @ luzuriag @ Serial 479  
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