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Affolter, J.; Tesei, M.; Pastoriza, H.; Leemann, C.; Martinoli, P. |
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Observation of Ising-like critical fluctuations in frustrated Josephson junction arrays with modulated coupling energies |
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2002 |
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Physica C |
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369 |
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313-316 |
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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. |
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BT @ hernan @ affolter02 |
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1 |
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Bahrs, S.; Goni, A.R.; Thomsen, C.; Maiorov, B.; Nieva, G.; Fainstein, A. |
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Title |
Rare-earth dependence of photoinduced chain-oxygen ordering in RBa2Cu3O7-x (x approximate to 0.3) investigated by Raman scattering |
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2002 |
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PHYSICAL REVIEW B |
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65 |
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2 |
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024522 |
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We investigated a set of oxygen – deficient RBa2Cu3O7-x (xapproximate to0.3) ceramic samples with Raman spectroscopy under resonant conditions for the defect-induced Cu-O chain related modes at 230 and 600 cm(-1). Emphasis was laid on the frequency and intensity of the modes for different rare-earth atoms, and especially on their dependence under illumination. The modes display photoinduced bleaching for all R, including the nonsuperconducting R = Pr. The dynamics of their bleaching following a temperature quench indicates similar complex relaxation processes for all samples. A simple stretched exponential with a common beta = 0.36+/-0.04 and a distribution of time constants ranging from 50 to 1400 s describes our data well. We discuss our results in connection to photoinduced chain-oxygen ordering in oxygen-deficient superconductors. |
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1098-0121 |
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ISI:000173213100111 |
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BT @ hernan @ |
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213 |
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Bauer, E.; Galatanu, A.; Rogl, P.; Berisso, M.G.; Pedrazzini, P.; Sereni, J.G. |
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Title |
Loss of magnetism in CePd2-xNixAl3 |
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2002 |
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PHYSICA B-CONDENSED MATTER |
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312 |
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464-465 |
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Hexagonal CePd2-xNixAl3 exhibits a crossover from a Kondo lattice showing magnetic order at T(N)similar or equal to2.8 K for xless than or equal to0.2 to intermediate valence (IV) for x-->2. Though T-N(x) is weakly affected upon Pd/Ni substitution before vanishing at finite temperature, the Kondo temperature T-K progressively increases. Above xsimilar or equal to0.3 the phase boundary no longer exists and strong spin fluctuations cause pronounced deviations from a Fermi-liquid ground state before the IV regime is established for xgreater than or equal to1. (C) 2002 Elsevier Science B.V. All rights reserved. |
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0921-4526 |
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ISI:000175871000171 |
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BT @ hernan @ |
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296 |
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Berisso, M.G.; Pedrazzini, P.; Deppe, M.; Trovarelli, O.; Geibel, C.; Sereni, J.G. |
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Composition dependence of the magnetic properties of Ge-doped CeCu2Si2 |
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2002 |
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PHYSICA B-CONDENSED MATTER |
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320 |
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1-4 |
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380-383 |
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Due to the proximity of CeCu2Si2 to a quantum critical point, the ground state of this compound is extremely sensitive to sample preparation conditions. Small excess of one component can lead to magnetic or superconducting behaviors. We found that in the alloy CeCu2(Si1-xGex)(2) a small excess of Ge enhances the homogeneity range allowing a precise investigation of stoichiometric effects on the physical properties. In this system, Ge doping produces an increment of the antiferromagnetic transition temperature T-N, while the superconducting one decreases. Particularly, it was found that at x = 0.1 both phases coexist at low temperature. In order to investigate the stability of these phases against changes of the Ce-ligands composition, we prepared a series of CeCu2+y(Si0.9Ge0.1)2-x, samples (0less than or equal toyless than or equal to0.10) and investigated their specific heat and electrical resistivity. We observed that the substitution of Si/Ge by Cu increases the characteristic temperature and weakens the magnetic contribution without modifying TN. A further transition, of the first order character, is observed at lower temperature. (C) 2002 Elsevier Science B.V. All rights reserved. |
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0921-4526 |
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ISI:000177607700103 |
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BT @ hernan @ |
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294 |
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Berisso, M.G.; Pedrazzini, P.; Sereni, J.G.; Trovarelli, O.; Geibel, C.; Steglich, F. |
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Title |
Study of Ce(Rh1-xPdx)(2)Si-2: pronounced differences between the CeRh2Si2 and CePd2Si2 ground states |
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Journal Article |
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2002 |
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EUROPEAN PHYSICAL JOURNAL B |
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30 |
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3 |
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343-349 |
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We present electrical resistivity and specific heat measurements of alloys on the Rh rich side of the phase diagram of the Ce(Rh1-xPdx)(2)Si-2 system. We compare these results with those obtained at intermediate and low Rh concentrations. The analysis of the concentration and temperature dependence of the entropy and of the scaling behaviour of C-et(T) and rho(T) clearly confirm a separation of the magnetic phase diagram into two regions: the region x less than or equal to 0.3, showing a concentration independent characteristic temperature for the 4f-electrons with T-0 approximate to 45 K, while for x > 0.3, T-0 decreases to T-0(x = 1) approximate to 15 K. At low Pd-content, T-N decreases very rapidly from T-N = 36 K in pure CeRh2Si2 to T-N = 18 K at x = 0.1. With higher Pd concentration T-N stabilizes at T-N approximate to 15 K whereas the magnitude of the anomalies in C-et(T) and in the susceptibility around T-N are further reduced and disappear at x approximate to 0.3. This differs from the behavior found on the Pd-rich side, where T-N decreases continuously to zero with increasing Rh content. The pronounced differences observed between both phase boundaries and the drastic effect of doping on the Rh rich side suggest an itinerant character in CeRh2 Si-2, in contrast with the localized character of CePd2Si2. Further evidence for the itinerant character of CeRh2Si2 is given by the rho(T) dependence observed for x less than or equal to 0.3, which scales with rho(T) of the prototype itinerant compound YCo2. |
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1434-6028 |
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ISI:000180850100009 |
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BT @ hernan @ |
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69 |
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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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Levy, G.; Maiorov, B.; Corvalan, M.S.; Fainstein, A.; Nieva, G. |
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Title |
Oxygen overdoping in superconducting and non-superconducting Y1-xPrxBa2Cu3Oy |
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Journal Article |
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2002 |
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PHYSICA B-CONDENSED MATTER |
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320 |
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1-4 |
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333-336 |
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We present the evolution of magnetic and structural properties of Y1-xPrxBa2Cu3Oy (xsimilar to0.5 and x = 1) single crystals and polycrystalline materials when the oxygen concentration y is varied from under- to overdoping. We have found a monotonous evolution of the Pr Neel temperature for x = 1 samples and a maximum of the superconducting critical temperature for the xsimilar to0.5 samples. The structural properties as detected by X-ray diffraction and Raman spectroscopy show no instabilities when crossing the optimal doping region as was found in the x = 0 material. (C) 2002 Elsevier Science B.V. All rights reserved. |
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0921-4526 |
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ISI:000177607700091 |
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BT @ hernan @ |
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211 |
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Luzuriaga, J. |
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Comment on “Super classical quantum mechanics: The best interpretation of nonrelativistic quantum mechanics” |
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2002 |
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American Journal of Physics |
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Am. J. Phys. |
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70 |
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1 |
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10-10 |
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0002-9505 |
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ISI:000172959200001 |
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BT @ hernan @ |
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245 |
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Maiorov, B.; Silhanek, A.V.; De la Cruz, F.; Osquiguil, E. |
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Comment on “strong vortex liquid correlation from multiterminal measurements on untwinned YBa2Cu3O7-? single crystals” |
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2002 |
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Physical Review Letters |
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Phys Rev Lett |
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88 |
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13 |
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1397031 |
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Multiterminal measurements using experimental technique on twinned and untwinned YBa2Cu3O7-? crystals were presented. Inhomogeneous current distribution acting upon an uncorrelated vortex system showed that the dissipation of voltage at the top was larger than at the bottom. The behavior of the current voltage curves showed that the result Vtop = Vbot was a consequence of the limited voltage sensitivity. |
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00319007 (ISSN) |
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Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; CODEN: PRLTA; Language of Original Document: English; Correspondence Address: Maiorov, B.; Centro At |
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BT @ osquigui @ |
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368 |
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Maiorov, B.; Silhanek, A.V.; De la Cruz, F.; Osquiguil, E.; Rydh, A.; Rapp, |
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Comment on “strong vortex liquid correlation from multiterminal measurements on untwinned YBa2Cu3O7-? single crystals” [2] (multiple letters) |
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Journal Article |
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2002 |
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Physical Review Letters |
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Phys Rev Lett |
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88 |
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13 |
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Current voltage characteristics; Electric potential; Extrapolation; Magnetic fields; Melting; Twinning; Vortex flow; Yttrium barium copper oxides; Multiterminal measurements; Single crystals |
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00319007 (ISSN) |
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Export Date: 17 April 2009; Source: Scopus; CODEN: PRLTA; Language of Original Document: English; Correspondence Address: Maiorov, B.; Centro At |
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