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Author Maiorov, B.; Silhanek, A.V.; De la Cruz, F.; Osquiguil, E.
Title Comment on “strong vortex liquid correlation from multiterminal measurements on untwinned YBa2Cu3O7-? single crystals” Type Journal Article
Year 2002 Publication Physical Review Letters Abbreviated Journal Phys Rev Lett
Volume 88 Issue 13 Pages (down) 1397031
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Abstract 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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ISSN 00319007 (ISSN) ISBN Medium
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Notes 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 Approved no
Call Number BT @ osquigui @ Serial 368
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Author Valenzuela, S.O.; Maiorov, B.; Osquiguil, E.; Bekeris, V.
Title Elastic-to-plastic crossover below the peak effect in the vortex solid of YBa2Cu3O7 single crystals Type Journal Article
Year 2002 Publication Physical Review B – Condensed Matter and Materials Physics Abbreviated Journal Phys. Rev. B Condens. Matter Mater. Phys.
Volume 65 Issue 6 Pages (down) 605041-605044
Keywords barium; copper; yttrium; analytic method; article; crystal structure; elasticity; molecular interaction; stress; structure analysis; temperature; vortex motion
Abstract We report on transport and ac susceptibility studies below the peak effect in twinned YBa2Cu3O7 single crystals. We find that disorder generated at the peak effect can be partially inhibited by forcing vortices to move with an ac driving current. The vortex system can be additionally ordered below a well-defined temperature where elastic interactions between vortices overcome pinning-generated stress and a plastic-to-elastic crossover seems to occur. The combined effect of these two processes results in vortex structures with different mobilities that give place to history effects.
Address Physics Department, Harvard University, Cambridge, MA 02138, United States
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ISSN 01631829 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 11; Export Date: 17 April 2009; Source: Scopus; Art. No.: 060504; CODEN: PRBMD; Language of Original Document: English; Correspondence Address: Valenzuela, S.O.; Physics Department; Harvard University Cambridge, MA 02138, United States; References: De Sorbo, W., (1964) Rev. Mod. Phys., 36, p. 90; Pippard, A.B., (1969) Philos. Mag., 19, p. 217; Larkin, A.I., Ovchinnikov, Y.N., (1979) J. Low Temp. Phys., 34, p. 409; W Approved no
Call Number BT @ osquigui @ Serial 370
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Author Maiorov, B.; Osquiguil, E.
Title Vortex solid state in YBa2Cu3O7-? twinned crystals Type Journal Article
Year 2001 Publication Physical Review B – Condensed Matter and Materials Physics Abbreviated Journal Phys. Rev. B Condens. Matter Mater. Phys.
Volume 64 Issue 5 Pages (down) 0525111-0525114
Keywords barium; copper derivative; yttrium; article; conductor; crystal; high temperature procedures; magnetic field; mathematical analysis; melting point; solid state; temperature; thermodynamics
Abstract We report on the scaling of transport properties around the vortex melting in YBa2Cu3O7-? oriented-twin single crystals in applied magnetic fields between 1 T and 18 T. We find that for the whole measured field range the linear resistivity scales as ?(t,?)?tsyF
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ISSN 01631829 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 6; Export Date: 17 April 2009; Source: Scopus; Art. No.: 052511; CODEN: PRBMD; Language of Original Document: English; Correspondence Address: Maiorov, B.; Centro At Approved no
Call Number BT @ osquigui @ Serial 371
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Author Correa, V. F; Villagrán Asiares, A. G.; Betancourth, D.; Encina, S.; Pedrazzini, P.; Cornaglia, P.S.; García D.J.; Sereni, J. G.; Maiorov, B; Caroca-Canales, N; Geibel, Ch.
Title Strong magnetoelastic effect in CeCo1−xFexSi as Néel order is suppressed Type Journal Article
Year 2019 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 100 Issue Pages (down) 184409
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Abstract A very strong magnetoelastic effect in the CeCo1−xFexSi alloys is reported. The strength of the magnetostrictive

effect can be tuned upon changing x. The moderate low-temperature linear magnetostriction observed at low

Fe concentrations becomes very large (L

L (16T, 2K) = 3 × 10−3) around the critical concentration xc ≈ 0.23 at

which the long-range antiferromagnetic order vanishes. Upon increasing doping through the nonmagnetic region

(x > xc), the magnetostriction strength gradually weakens again. The interplay between magnetic order and the

Kondo screening appears to cause an enhanced valence susceptibility slightly changing the Ce ions valence,

ultimately triggering the large magnetostriction observed around the critical concentration. Previous studies

of the evolution of the lattice parameters with x as well as magnetization and x-ray absorption spectroscopy

measurements support this hypothesis.
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Call Number BT @ victor.correa @ Serial 842
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Author Bahrs, S.; Guimpel, J.; Goni, A.R.; Maiorov, B.; Fainstein, A.; Nieva, G.; Thomsen, C.
Title Persistent photo-excitation in GdBa2Cu3O6.5 in a simultaneous Raman and electrical-transport experiment Type Journal Article
Year 2005 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 72 Issue 14 Pages (down) 144501
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Abstract We investigate the connection between persistent illumination-induced effects in underdoped RBa2Cu3O7-delta known as persistent photoconductivity and Raman bleaching. Despite the long-standing assumption that the electrical and optical properties respond to the same light-induced change in the material, they have not been directly compared until now. We present a simultaneous experiment of Raman spectroscopy and electrical transport under visible illumination at low temperatures. The time dependence of the response in the two methods differs by two orders of magnitude, showing that the effects are connected but not identical. We discuss our results within the oxygen-vacancy reordering model of photobleaching and find that different Cu-O chain lengths affect the optical and the electrical response differently. Raman bleaching and persistent photoconductivity thus provide a different perspective on the microscopic oxygen vacancy distribution.
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ISSN 1098-0121 ISBN Medium
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Notes ISI:000232934100060 Approved no
Call Number BT @ hernan @ Serial 204
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Author Bahrs, S.; Goni, A.R.; Thomsen, C.; Maiorov, B.; Nieva, G.; Fainstein, A.
Title Rare-earth dependence of photoinduced chain-oxygen ordering in RBa2Cu3O7-x (x approximate to 0.3) investigated by Raman scattering Type Journal Article
Year 2002 Publication PHYSICAL REVIEW B Abbreviated Journal
Volume 65 Issue 2 Pages (down) 024522
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Abstract 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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ISSN 1098-0121 ISBN Medium
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Notes ISI:000173213100111 Approved no
Call Number BT @ hernan @ Serial 213
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Author Bahrs, S.; Goni, A.R.; Thomsen, C.; Maiorov, B.; Nieva, G.; Fainstein, A.
Title Light-induced oxygen-ordering dynamics in (Y,Pr)Ba2Cu3O6.7: A Raman spectroscopy and Monte Carlo study Type Journal Article
Year 2004 Publication PHYSICAL REVIEW B Abbreviated Journal
Volume 70 Issue 1 Pages (down) 014512
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Abstract We investigated the time and temperature dependence of photobleaching effects in RBa2Cu3O7-delta single crystals (R=Y,Pr) by Raman spectroscopy and Monte Carlo simulations based on the asymmetric next-nearest-neighbor Ising model. In a temperature range between 40 and 300 K the bleaching slows down on cooling, displaying a pronounced change in dynamics around 160 K for R=Y. To model this behavior we extended the Ising model by introducing a single energy barrier which impedes oxygen movement in the plane unless the oxygen atoms are excited by light. We obtain a time- and temperature-dependent development of superstructures under illumination with the fastest change at intermediate model temperatures. The chain-fragment development in the simulation thus matches the experimental low-temperature dynamics of Raman photobleaching, providing further support for oxygen reordering in the chain plane being at the origin of Raman photobleaching and related effects.
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ISSN 1098-0121 ISBN Medium
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Notes ISI:000222996300096 Approved no
Call Number BT @ hernan @ Serial 207
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Author Maiorov, B.; Nieva, G.; Osquiguil, E.
Title First-order phase transition of the vortex lattice in twinned YBa2Cu3O7 single crystals in tilted magnetic fields Type Journal Article
Year 2000 Publication Physical Review B – Condensed Matter and Materials Physics Abbreviated Journal Phys. Rev. B Condens. Matter Mater. Phys.
Volume 61 Issue 18 Pages (down) 12427-12432
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Abstract We present an exhaustive analysis of transport measurements performed in twinned YBa2Cu3O7 single crystals which establishes that the vortex solid-liquid transition is first order when the magnetic field H is applied at an angle ? away from the direction of the twin planes. We show that the resistive transitions are hysteretic and the V-I curves are nonlinear, displaying a characteristic S shape at the melting line Hm(T), which scales as ?(?)Hm(T,?), where ?(?) is the anisotropy factor. These features are gradually lost when the critical point H*(?) is approached. Above H*(?) the V-I characteristics show a linear response in the experimentally accessible V-I window, and the transition becomes reversible. Finally we show that the first-order phase transition takes place between a highly correlated vortex liquid in the field direction and a solid state of unknown symmetry. As a consequence, our data support the scenario for a vortex-line melting in twinned YBa2Cu3O7 crystals in contrast to a vortex sublimation as recently suggested for untwinned La2-xSrxCuO4, YBa2Cu3O7 and Bi2Sr2CaCu2O8 [T. Sasagawa et al., Phys. Rev. Lett. 80, 4297 (1998)].
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Series Editor Series Title Abbreviated Series Title
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ISSN 01631829 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 5; Export Date: 17 April 2009; Source: Scopus; CODEN: PRBMD; Language of Original Document: English; Correspondence Address: Maiorov, B.; Centro At Approved no
Call Number BT @ osquigui @ Serial 372
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Author Fainstein, A.; Maiorov, B.; Guimpel, J.; Nieva, G.; Osquiguil, E.
Title Annealing disorder and photoinduced order of oxygen chains in detwinned YBa2Cu3O6.65 single crystals probed by Raman scattering Type Journal Article
Year 2000 Publication Physical Review B – Condensed Matter and Materials Physics Abbreviated Journal Phys. Rev. B Condens. Matter Mater. Phys.
Volume 61 Issue 6 Pages (down) 4298-4304
Keywords
Abstract Raman scattering in detwinned YBa2Cu3O6.65 single crystals is studied as a function of photoexcitation and annealing. Copper-oxygen chain-related forbidden Raman bands that are known to strongly bleach with illumination at low temperatures, increase their intensity with chain fragmentation induced by annealing at high temperature. This contrasting behavior proves the conjunction of short Cu-O fragments into longer chains on photoexcitation. We interpret the Raman modes as due to vibrations at the end of CuO chain fragments and Cu-O-Cu monomers, and use their evolution with illumination and annealing as anisotropic sensitive markers of oxygen reordering processes. The identification of the “forbidden” Raman bands is discussed in the context of our results and recent literature in the subject. We also present absorption measurements performed on GdBa2Cu3Ox thin films with varying oxygen content. These experiments show that the 2.2-eV absorption and the chain-related Raman peaks have different dependencies with oxygen content and illumination, ruling out an explanation that suggests that the Raman intensity reduction of these modes is due to a photobleaching of intermediate defect states. These results highlight the potentialities of Raman scattering for oxygen dynamics studies and demonstrate the presence of photoinduced oxygen ordering in these high-Tc superconductor compounds.
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ISSN 01631829 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 18; Export Date: 17 April 2009; Source: Scopus; CODEN: PRBMD; Language of Original Document: English; Correspondence Address: Fainstein, A.; Centro At Approved no
Call Number BT @ osquigui @ Serial 374
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Author Decca, R.S.; Drew, H.D.; Osquiguil, E.; Maiorov, B.; Guimpel, J.
Title Anomalous proximity effect in underdoped YBa2Cu3O6+x Josephson junctions Type Journal Article
Year 2000 Publication Physical Review Letters Abbreviated Journal Phys Rev Lett
Volume 85 Issue 17 Pages (down) 3708-3711
Keywords Critical currents; Energy gap; High temperature superconductors; Magnetic field effects; Magnetron sputtering; Mathematical models; Phase diagrams; Phase transitions; Physical properties; Scanning electron microscopy; Superconductivity; Yttrium barium copper oxides; Anomalous proximity effect; Fluctuating phase models; Josephson effect; Photodoping; Josephson junction devices
Abstract Experiments were carried out to probe the underdoped insulating material by the Josephson effect. Junctions were fabricated by exploiting the capability of locally photodoping insulating RBa2Cu3O6+x (R = rare earth) material. The existence of an anomalously large proximity effect was confirmed. The critical current of the junctions was consisted with the conventional Josephson relationship.
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Publisher American Inst of Physics Place of Publication Woodbury, NY, United States Editor
Language Summary Language Original Title
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ISSN 00319007 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 36; Export Date: 17 April 2009; Source: Scopus; CODEN: PRLTA; doi: 10.1103/PhysRevLett.85.3708; Language of Original Document: English; Correspondence Address: Decca, R.S.; Univ of Maryland College Park, United States; References: Ginsberg, D.M., (1996) Physical Properties of High Temperature Superconductors V, , World Scientific, Singapore; Zhang, S.C., (1997) Science, 275, p. 1089; Emery, V.J., Kivelson, S.A., (1995) Nature (London), 374, p. 434; Corson, J., (1999) Nature (London), 398, p. 291; Renner, Ch., (1998) Phys. Rev. Lett., 80, p. 149; Demler, E., (1998) Phys. Rev. Lett., 80, p. 2917; Den Hertog, B.C., Berlinsky, A.J., Kallin, C., (1999) Phys. Rev. B, 59, pp. R11645; Emery, V.J., Kivelson, S.A., Zachar, O., (1997) Phys Rev. B, 56, p. 6120; Tinkham, M., (1996) Introduction to Superconductivity, , McGraw-Hill, New York; Decca, R.S., (1998) Appl. Phys. Lett., 73, p. 120; (1999) J. Microsc., 194, p. 407; Osquiguil, E., (1992) Appl. Phys. Lett., 60, p. 1627; Kudinov, V.I., (1993) Phys. Rev. B, 47, p. 9017; Decca, R.S., Drew, H.D., Empson, K.L., (1997) Appl. Phys. Lett., 70, p. 1932; Orenstein, J., (1990) Phys. Rev. B, 42, p. 6342; Nieva, G., (1992) Appl. Phys. Lett., 60, p. 2159; (1992) Phys. Rev. B, 46, p. 14249; notenoteGray, K.E., (1992) Phys. Rev. B, 45, p. 10071; Pauza, A.J., (1997) J. Appl. Phys., 82, p. 5612; Katz, A.S., Woods, S.I., Dynes, R.C., (2000) J. Appl. Phys., 87, p. 2978; noteUR – http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-19244384844&partnerID=40 Approved no
Call Number BT @ osquigui @ Serial 373
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