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Author Fainstein, A.; Maiorov, B.; Guimpel, J.; Nieva, G.; Osquiguil, E.
Title (up) 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 4298-4304
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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 (up) 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 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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Author Maiorov, B.; Osquiguil, E.
Title (up) 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 Maiorov, B.; Silhanek, A.V.; De la Cruz, F.; Osquiguil, E.
Title (up) 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 1397031
Keywords
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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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 Maiorov, B.; Silhanek, A.V.; De la Cruz, F.; Osquiguil, E.; Rydh, A.; Rapp,
Title (up) Comment on “strong vortex liquid correlation from multiterminal measurements on untwinned YBa2Cu3O7-? single crystals” [2] (multiple letters) Type Journal Article
Year 2002 Publication Physical Review Letters Abbreviated Journal Phys Rev Lett
Volume 88 Issue 13 Pages
Keywords Current voltage characteristics; Electric potential; Extrapolation; Magnetic fields; Melting; Twinning; Vortex flow; Yttrium barium copper oxides; Multiterminal measurements; Single crystals
Abstract
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Notes 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 369
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Author Lee, S.-C.; Sullivan, M.; Ruchti, G.R.; Anlage, S.M.; Palmer, B.S.; Maiorov, B.; Osquiguil, E.
Title (up) Doping-dependent nonlinear Meissner effect and spontaneous currents in high-Tc superconductors Type Journal Article
Year 2005 Publication Physical Review B – Condensed Matter and Materials Physics Abbreviated Journal Phys. Rev. B Condens. Matter Mater. Phys.
Volume 71 Issue 1 Pages
Keywords article; electric current; film; magnetic field; magnetism; microwave radiation; nonlinear system; parameter; superconductor; temperature dependence
Abstract We measure the local harmonic generation from superconducting thin films at microwave frequencies to investigate the intrinsic nonlinear Meissner effect near Tc in the zero magnetic field. Both second and third harmonic generation are measured to identify time-reversal symmetry breaking (TRSB) and time-reversal symmetric (TRS) nonlinearities. We perform a systematic doping-dependent study of the nonlinear response and find that the TRS characteristic nonlinearity current density scale follows the doping dependence of the depairing critical current density. We also extract a spontaneous TRSB characteristic current density scale that onsets at Tc, grows with decreasing temperature, and systematically decreases in magnitude (at fixed T/TC) with underdoping. The origin of this current scale could be Josephson circulating currents or the spontaneous magnetization associated with a TRSB order parameter.
Address Superconductivity Technology Center, Mail Stop K763, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
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Notes Cited By (since 1996): 4; Export Date: 17 April 2009; Source: Scopus; CODEN: PRBMD; doi: 10.1103/PhysRevB.71.014507; Language of Original Document: English; Correspondence Address: Lee, S.-C.; Ctr. for Superconductivity Research; Department of Physics; University of Maryland College Park, MD 20742-4111, United States; References: Yip, S.K., Sauls, J.A., (1992) Phys. Rev. Lett., 69, p. 2264; Xu, D., Yip, S.K., Sauls, J.A., (1995) Phys. Rev. B, 51, p. 16233; Gittleman, J., Rosenblum, B., Seidel, T.E., Wicklund, A.W., (1965) Phys. Rev., 137, pp. A527; Buan, J., Stojkovic, B.P., Israeloff, N.E., Goldman, A.M., Huang, C.C., Valls, O.T., Liu, J.Z., Shelton, R., (1994) Phys. Rev. Lett., 72, p. 2632; Maeda, A., Iino, Y., Hanaguri, T., Motohira, N., Kishio, K., Fukase, T., (1995) Phys. Rev. Lett., 74, p. 1202; Carrington, A., Giannetta, R.W., Kim, J.T., Giapintzakis, J., (1999) Phys. Rev. B, 59, pp. R14 173; Bidinosti, C.P., Hardy, W.N., Bonn, D.A., Liang, R., (1999) Phys. Rev. Lett., 83, p. 3277; Benz, G., W Approved no
Call Number BT @ osquigui @ Serial 365
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Author Gonzalez, E.M.; Sefrioui, Z.; Maiorov, B.; Osquiguil, E.; Santamar
Title (up) Effects of structural microdomains on the vortex correlation length in a-axis oriented EuBa2Cu3O7 thin films Type Journal Article
Year 2006 Publication Journal of Physics and Chemistry of Solids Abbreviated Journal J Phys Chem Solids
Volume 67 Issue 1-3 Pages 399-402
Keywords A. Superconductors; A. Thin films; B. Epitaxial growth; D. Superconductivity; D. Transport properties; Activation energy; Anisotropy; Epitaxial growth; Europium compounds; Magnetron sputtering; Superconductivity; Thin films; Transport properties; Anisotropic superconductors; Domain boundaries; Structural microdomains; Vortex correlation; Superconducting materials
Abstract We have grown a-axis oriented EuBa2Cu3O7 thin films on SrTiO3 (001) substrates using a magnetron sputtering technique. In these films the CuO2 planes are aligned parallel to the substrates. The film microstructure shows microdomains. The microdomains are grains with a 90
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ISSN 00223697 (ISSN) ISBN Medium
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Notes Export Date: 17 April 2009; Source: Scopus; CODEN: JPCSA; doi: 10.1016/j.jpcs.2005.10.093; Language of Original Document: English; Correspondence Address: Vicent, J.L.; Departamento F Approved no
Call Number BT @ osquigui @ Serial 364
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Author Valenzuela, S.O.; Maiorov, B.; Osquiguil, E.; Bekeris, V.
Title (up) 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 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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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.; Nieva, G.; Osquiguil, E.
Title (up) 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 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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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 Granada, M.; Maiorov, B.; Sirena, M.; Steren, L.B.; Guimpel, J.
Title (up) Hall effect in La0.6Sr0.4MnO3 thin films Type Journal Article
Year 2004 Publication JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Abbreviated Journal
Volume 272 Issue Pages 1836-1838
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Abstract We studied the temperature and thickness dependence of the transport properties of La0.6Sr0.4MnO3 films. Hall voltage and magnetoresistance measurements on 10 and 150 nm thick films were performed with this porpose. From the ordinary Hall component, we calculated the density of carriers, which has hole-character and is systematically lower than that expected from the chemical composition of the manganite in both samples. Localization effects observed at low temperature in the resistivity of the thinner film, associated with the substrate-induced disorder, are correlated with a decrease of the density of carriers. (C) 2003 Elsevier B.V. All rights reserved.
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Notes ISI:000222236800084 Approved no
Call Number BT @ hernan @ Serial 164
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