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Author Niebieskikwiat, D.; Haberkorn, N.; Guitarra, R.; Guimpel, J.
Title Magnetic properties of SrTiO3/Pr2/3Ca 1/3MnO3 multilayers Type Conference Article
Year 2010 Publication Journal of Physics: Conference Series Abbreviated Journal
Volume 200 Issue 7 Pages (up) 072069
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Abstract Nanoscale ferromagnetic (FM) clusters embedded within insulating (I) layers of the antiferromagnetic Pr2/3Ca1/3MnO3 (PCMO) are known to improve the magnetoresistance ratio of FM-I magnetoresistive multilayers. Here, we study the magnetic properties of perovskite superlattices comprised of five PCMO layers of variable thickness t separated by 5nm-thick spacers of SrTiO3 (STO). Several multilayers (1.5 nm ≤ t ≤ 8 nm) were grown on (001) STO substrates by magnetron sputtering. We show that the magnetic moment of PCMO due to the FM inclusions presents a maximum for t ∼ 3 nm, accompanied by an abrupt increase of coercivity and exchange bias field. The nonmagnetic nature of the neighboring STO layers demonstrates that the observed behavior is not related to any interlayer exchange coupling, but the geometrical matching between layer thickness and FM domain size is the key driver for the enhancement of the FM moment and anisotropy energy. These results open a new door for the optimization of perovskite based spintronic devices.
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Call Number BT @ hernan @ Serial 602
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Author Dolz, M.I.; Kolton, A.B.; Pastoriza, H.
Title Direct determination of the collective pinning radius in the cuprate superconductor Bi2 Sr2 CaCu2 O8+ delta Type Journal Article
Year 2010 Publication Physical Review B Abbreviated Journal PRB
Volume 81 Issue 9 Pages (up) 092502
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Abstract We study the onset of the irreversible magnetic behavior of vortex matter in micron-sized Bi2Sr2CaCu2O8+δ single crystals by using silicon micro-oscillators. We find an irreversibility line appearing well below the thermodynamic Bragg-glass melting line at a magnetic field which increases both with increasing the sample radius and with decreasing the temperature, paradoxically implying the existence of a reversible vortex solid. We show that at this irreversibility line, the sample radius can be identified with the crossover length between the Larkin and the random-manifold regimes of the vortex-lattice transverse roughness. Our method thus allows to determine, as a function of temperature and applied magnetic field, the minimum size of a vortex system that can be collectively pinned, or the so-called three-dimensional weak collective pinning Larkin radius, in a direct way.
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Publisher American Physical Society Place of Publication Editor
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Call Number BT @ hernan @ Serial 587
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Author Sirena, M.; Zimmers, A; Haberkorn, N.; Kaul, E.E.; Steren, L.B.; Lesueur, J.; Wolf, T.; Le Gall, Y.; Grob, J.-J.; Faini, G.
Title Direct observation of electronic inhomogeneities induced by point defect disorder in manganite films Type Journal Article
Year 2010 Publication Journal of Applied Physics Abbreviated Journal JAP
Volume 107 Issue Pages (up) 113903
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Call Number BT @ ekaul @ Serial 633
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Author M. Sirena, A. Zimmers, N. Haberkorn, E. E. Kaul, L. B. Steren, J. Lesueur, T. Wolf, Y. Le Gall, J.-J. Grob y G. Faini
Title nfluence of ion implantation on the magnetic and transport properties of manganite Films Type Journal Article
Year 2010 Publication Physical Review B (Condensed Matter and Materials Physics) Abbreviated Journal PRB
Volume 81 Issue Pages (up) 134439
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Call Number BT @ ekaul @ Serial 634
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Author Piriou, A.; Giannini, E.; Fasano, Y.; Senatore, C.; Fischer, O.
Title Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi2Sr2CuO6+d crystals Type Journal Article
Year 2010 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 81 Issue Pages (up) 144517-144524
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Call Number BT @ yanina.fasano @ Serial 592
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Author Fasano, Y.; Maggio-Aprile, I.; Zhigadlo, N. D.; Katrych, S.; Karpinski, J.; Fischer, Ø.
Title Local quasiparticle density of states of superconducting SmFeAsO1 − xFx single crystals: Evidence for spin-mediated pairing Type Journal Article
Year 2010 Publication Physical Review Letters Abbreviated Journal PRL
Volume 105 Issue Pages (up) 167005-167008
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Call Number BT @ yanina.fasano @ Serial 600
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Author Sereni, J.G.; Gómez Berisso, M.; Schmerber, G.; Kappler, J.P.
Title Suppression of the Shastry-Sutherland phase in Ce2 Pd 2 Sn at a field-induced critical point Type Journal Article
Year 2010 Publication Physical Review B – Condensed Matter and Materials Physics Abbreviated Journal Phys. Rev. B Condens. Matter Mater. Phys.
Volume 81 Issue 18 Pages (up) 184429
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Abstract The magnetic phase diagram of Ce2 Pd2 Sn is investigated through the field dependence of thermal, transport, and magnetic properties at low temperature. The upper transition, TM =4.8 K is slightly affected by magnetic field up to B=1 T whereas the lower one T C (B) rapidly increases from 2.1 K joining TM in a critical point at Tcr = (4.1±0.2) K for Bcr = (0.11±0.01) T. At that point, the intermediate phase, previously described as an unstable Shastry-Sutherland lattice, is suppressed. A detailed analysis around the critical point reveals a structure in the maximum of the ∂ M/∂ B (B) derivative, which may be related to a step in magnetization predicted by theory for the mentioned lattice. © 2010 The American Physical Society.
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ISSN 10980121 (ISSN) ISBN Medium
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Call Number BT @ berisso @ Serial 595
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Author Alejandro, G.; Steren, L. B.; Pastoriza, H.; Vega, D.; Granada, M.; Rojas Sánchez, J. C.; Sirena, M.; Alascio, B.
Title Magnetoresistance effect in (La, Sr)MnO_3 bicrystalline films Type Journal Article
Year 2010 Publication Journal of Physics: Condensed Matter Abbreviated Journal
Volume 22 Issue 34 Pages (up) 346007
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Abstract The angular dependence of the magnetoresistance effect has been measured on bicrystalline La 0.75 Sr 0.25 MnO 3 films. The measurements have been performed on an electronically lithographed Wheatstone bridge. The study of the angular dependence of both the magnetoresistance and the resistance of single-crystalline and grain-boundary regions of the samples allowed us to isolate two contributions of low-field magnetoresistance in manganites. One of them is associated with the spin–orbit effect, i.e. the anisotropic magnetoresistance of ferromagnetic compounds, and the other one is related to spin-disorder regions at the grain boundary. Complementary x-ray diffraction, ferromagnetic resonance and low temperature magnetization experiments contribute to the characterization of the magnetic anisotropy of the samples and the general comprehension of the problem.
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ISSN 0953-8984 ISBN Medium
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Call Number BT @ hernan @ Serial 596
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