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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 (down) 2019 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 100 Issue Pages 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 Gonzalez, E.M.; Sefrioui, Z.; Maiorov, B.; Osquiguil, E.; Santamar
Title Effects of structural microdomains on the vortex correlation length in a-axis oriented EuBa2Cu3O7 thin films Type Journal Article
Year (down) 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 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 (down) 2005 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 72 Issue 14 Pages 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 Lee, S.-C.; Sullivan, M.; Ruchti, G.R.; Anlage, S.M.; Palmer, B.S.; Maiorov, B.; Osquiguil, E.
Title Doping-dependent nonlinear Meissner effect and spontaneous currents in high-Tc superconductors Type Journal Article
Year (down) 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 Granada, M.; Maiorov, B.; Sirena, M.; Steren, L.B.; Guimpel, J.
Title Hall effect in La0.6Sr0.4MnO3 thin films Type Journal Article
Year (down) 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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ISSN 0304-8853 ISBN Medium
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Notes ISI:000222236800084 Approved no
Call Number BT @ hernan @ Serial 164
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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 (down) 2004 Publication PHYSICAL REVIEW B Abbreviated Journal
Volume 70 Issue 1 Pages 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 Rigal, L.B.; Schmadel, D.C.; Drew, H.D.; Maiorov, B.; Osquiguil, E.; Preston, J.S.; Hughes, R.; Gu, G.D.
Title Magneto-optical evidence for a gapped Fermi surface in underdoped YBa 2Cu3O6+x Type Journal Article
Year (down) 2004 Publication Physical Review Letters Abbreviated Journal Phys Rev Lett
Volume 93 Issue 13 Pages
Keywords Antiferromagnetism; Carrier concentration; Cyclotrons; Doping (additives); Faraday effect; Hall effect; High temperature superconductors; Magnetic susceptibility; Magnetooptical effects; Photoemission; Yttrium barium copper oxides; Fermi arcs; Hall frequency; Magnetic excitations; Photoemission spectroscopy; Fermi surface
Abstract An evidence presented that supports partial gapping of the Fermi surface by a measurement of the Hall frequency from high frequency magneto-optical measurements on underdoped YBa2Cu3O6+x (YBCO) was discussed. It was found that the Hall frequency was obtained independently of the unknown k-space dependence of the carrier scattering rates that complicated the dc Hall effect. It was observed that the frequency dependence of the Hall angle was Drude-like and indicated a quasielastic relaxation process for optimal and underdoped samples. The results show that there was an increase of the Hall frequency in the pseudogap state.
Address Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, United States
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Notes Cited By (since 1996): 13; Export Date: 17 April 2009; Source: Scopus; CODEN: PRLTA; doi: 10.1103/PhysRevLett.93.137002; Language of Original Document: English; Correspondence Address: Rigal, L.B.; Department of Physics; University of Maryland College Park, MD 20742, United States; References: Timusk, T., Statt, B., (1999) Rep. Prog. Phys., 62, p. 61; Tallon, J.L., Loram, J.W., (2001) Physica (Amsterdam), 349 C, p. 53; Damascelli, A., Hussain, Z., Shen, Z.-X., (2003) Rev. Mod. Phys., 75, p. 473; Chakravarty, S., Nayak, C., Tewari, S., (2003) Phys. Rev. B, 68, pp. 100504R; Chakravarty, S., (2002) Phys. Rev. Lett., 89, p. 277003; Tranquada, J., (1995) Nature (London), 375, p. 561; Tranquada, J., (1997) Phys. Rev. Lett., 78, p. 338; Orenstein, J., Millis, A.J., (2000) Science, 288, p. 468; Brinkman, W.F., Rice, T.M., (1971) Phys. Rev. B, 4, p. 1566; Lange, E., Eotliar, G., (1999) Phys. Rev. Lett., 82, p. 1317; Cerne, J., (2003) Rev. Sci Instrum., 74, p. 4755; Rotter, L.D., (1991) Phys. Rev. Lett., 67, p. 2741; Schutzmann, J., (1992) Phys. Rev. B, 46, p. 512; Cooper, S.L., (1992) Phys. Rev. B, 45, p. 2549; Cerne, J., (2000) Phys. Rev. B, 61, p. 8133; Cerne, J., (2000) Phys. Rev. Lett., 84, p. 3418; Konstantinovic, Z., Li, Z.Z., Raffy, H., (2000) Phys. Rev. B, 62, pp. R11 989; Hwang, H.Y., (1994) Phys. Rev. Lett., 72, p. 2636; Chien, T.R., Wang, Z.Z., Ong, N.P., (1991) Phys. Rev. Lett., 67, p. 2088; Harris, J.M., Tan, Y.F., Ong, N.P., (1991) Phys. Rev. B, 46, p. 14293; Zheleznyak, A.T., (1998) Phys. Rev. B, 57, p. 3089; Shen, Z.X., Dassau, D., (1995) Phys. Rep., 253, p. 1; Schabel, M.C., (1998) Phys. Rev. B, 57, p. 6090; (1998) Phys. Rev. B, 57, p. 6107; Johnson, P.D., (2001) Phys. Rev. Lett., 87, p. 177007; S. Tewari et al., cond-mat/0310165Cooper, S.L., (1993) Phys. Rev. B, 47, p. 8233; Orenstein, J., (1990) Phys. Rev. B, 42, p. 6342; Puchkov, A.V., Basov, D.N., Timusk, T., (1996) J. Phys. Condens. Matter, 8, p. 10049 Approved no
Call Number BT @ osquigui @ Serial 366
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Author Maiorov, B.; Osquiguil, E.
Title Bose-glass-like phases in oriented-twin YBa2Cu3O7-? crystals Type Journal Article
Year (down) 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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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 Bahrs, S.; Goni, A.R.; Maiorov, B.; Nieva, G.; Fainstein, A.; Thomsen, C.
Title Raman-study of photoinduced chain-oxygen ordering in RBa2Cu3O7-delta Type Journal Article
Year (down) 2003 Publication IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY Abbreviated Journal
Volume 13 Issue 2 Pages 3192-3195
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Abstract We investigated Raman-forbidden signals in RBa2Cu3O7-delta with R = Y or Pr, which lose intensity under illumination at low temperatures. These defect-induced,peaks are only visible in oxygen-deficient material and for light polarized parallel to the copper-oxygen chains along the material's b-axis. In a first, two-laser based experiment we established that the bleaching effect of the light is polarization dependent as well. From this and other known properties we conclude that the signal is connected to the copper-oxygen chains, reflecting their state of disorder, and is thus closely related to aging and to the persistent photoconductivity effect in the material. In a second set of experiments we followed the temperature dependence of the Raman spectra and the intensity decrease.
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ISSN 1051-8223 ISBN Medium
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Notes ISI:000184242400193 Approved no
Call Number BT @ hernan @ Serial 209
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Author Maiorov, Boris A.
Title Transición de fase y dinámica de vórtices en YBa2Cu3O7-δ Type Book Whole
Year (down) 2003 Publication Abbreviated Journal
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Address Instituto Balseiro
Corporate Author Thesis Ph.D. thesis
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Call Number BT @ hernan @ Serial 333
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