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Author Navarro, H.; Yang, I.; Sirena, M.; Kim, J.; Haberkorn, N.
Title (up) Characterization of the insulator barrier and the superconducting transition temperature in GdBa2Cu3O7−δ/BaTiO3 bilayers for application in tunnel junctions Type Journal Article Article
Year 2015 Publication Journal of Applied Physics Abbreviated Journal J. Appl. Phys.
Volume 118 Issue 4 Pages 045308
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Abstract The optimization of the superconducting properties in a bottom electrode and the quality of an insulator barrier are the first steps in the development of superconductor/insulator/superconductor tunnel junctions. Here, we study the quality of a BaTiO3 tunnel barrier deposited on a 16 nm thick GdBa2Cu3O7−δ thin film by using conductive atomic force microscopy. We find that the tunnel current is systematically reduced (for equal applied voltage) by increasing the BaTiO3 barrier thickness between 1.6 and 4 nm. The BaTiO3 layers present an energy barrier of ≈1.2 eV and an attenuation length of 0.35–0.5 nm (depending on the applied voltage). The GdBa2Cu3O7−δ electrode is totally covered by a BaTiO3 thickness above 3 nm. The presence of ferroelectricity was verified by piezoresponse force microscopy for a 4 nm thick BaTiO3 top layer. The superconducting transition temperature of the bilayers is systematically suppressed by increasing the BaTiO3 thickness. This fact can be associated with stress at the interface and a reduction of the orthorhombicity of the GdBa2Cu3O7−δ. The reduction in the orthorhombicity is expected by considering the interface mismatch and it can also be affected by reduced oxygen stoichiometry (poor oxygen diffusion across the BaTiO3 barrier).
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Call Number BT @ pedrazp @ Serial 727
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Author Sirena, M.; Haberkorn, N.; Granada, M.; Steren, L.B.; Guimpel, J.
Title (up) Correlation between structure and magnetic properties of manganite-based multilayers Type Journal Article
Year 2003 Publication JOURNAL OF APPLIED PHYSICS Abbreviated Journal
Volume 93 Issue 10 Pages 7244-7246
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Abstract We have studied the structure, magnetic, and transport properties of manganite-based multilayers A/B-i, with A=La0.55Sr0.45MnO3 (metallic ferromagnet), and spacers (B-i) of different nature: B-1=SrTiO3 (nonmagnetic insulator), B-2=La0.9Sr0.1MnO3 (insulator ferromagnet), and B-3=La0.67Ca0.33MnO3 (paramagnetic-insulator/ferromagnet-metal). The samples are strongly textured in the direction perpendicular to the sample surface, and present a good interface quality with small roughness and interdiffusion. We have found that in the A/B-1/A trilayers, the ferromagnetic electrodes are ferromagnetically coupled for thin spacer layers and becomes decoupled for spacer thickness larger than 3 nm. Instead, the others multilayers are ferromagnetic for all spacer thicknesses and temperature range. This result was expected for temperatures well below the spacer Curie temperature. We attributed the ferromagnetic behavior of the system, found for temperatures above the ordering temperature of the spacer, to direct exchange coupling through short-range ordered zones in spacer layer. As expected from magnetization results, in fact, no extrinsic magnetoresistance was measured in these systems in the temperature range between 4.2 and 300 K. (C) 2003 American Institute of Physics.
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ISSN 0021-8979 ISBN Medium
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Notes ISI:000182822300273 Approved no
Call Number BT @ hernan @ Serial 168
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Author Ogando, K.; Pastoriza, H.
Title (up) Design of integration-ready metasurface-based infrared absorbers Type Journal Article
Year 2015 Publication Journal of Applied Physics Abbreviated Journal J. Appl. Phys.
Volume 118 Issue 4 Pages 043109
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Abstract We introduce an integration ready design of metamaterial infrared absorber, highly compatible with many kinds of fabrication processes. We present the results of an exhaustive experimental characterization, including an analysis of the effects of single meta-atom geometrical parameters and collective arrangement. We confront the results with the theoretical interpretations proposed in the literature. Based on the results, we develop a set of practical design rules for metamaterial absorbers in the infrared region.
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Call Number BT @ hernan @ Serial 718
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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 (up) 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 113903
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Call Number BT @ ekaul @ Serial 633
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Author El-Khatib, S.; Alsmadi, A.M.; Correa, V.; Andreev, A.V.; Lacerda, A.; Nasreen, F.; Nakotte, H.
Title (up) Electronic properties of single crystalline UNi[sub 0.39]Rh[sub 0.61]Al Type Journal Article
Year 2008 Publication Journal of Applied Physics Abbreviated Journal J. Appl. Phys.
Volume 103 Issue 7 Pages 07B714-3
Keywords aluminium alloys; antiferromagnetic materials; ferromagnetic materials; magnetic moments; magnetisation; magnetoresistance; nickel alloys; phase diagrams; rhodium alloys; thermal expansion; uranium alloys
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Publisher AIP Place of Publication Editor
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Call Number BT @ hernan @ Serial 306
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Author Haberkorn, N.; Lovey, F.; Condo, A.M.; Guimpel, J.
Title (up) High-resolution transmission electron microscopy study of the interfaces and stacking defects in superconducting/magnetic perovskite superlattices Type Journal Article
Year 2005 Publication JOURNAL OF APPLIED PHYSICS Abbreviated Journal
Volume 97 Issue 5 Pages
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Abstract We studied the microstructure of GdBa2Cu3O7-delta/La0.6Sr0.4MnO3 superlattices grown on (001)MgO substrates by high-resolution transmission electron microscopy. The superlattices show two different epitaxial growths. In addition different types of interfaces between the layers were found. Moreover, several kinds of stacking faults and domain boundaries were observed in both materials. The crystallography of the interfaces and the defects was analyzed and their role on the physical properties of the superlattices is discussed. (C) 2005 American Institute of Physics.
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ISSN 0021-8979 ISBN Medium
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Notes ISI:000227766900024 Approved no
Call Number BT @ hernan @ Serial 159
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Author Sirena, M.; Haberkorn, N.; Steren, L.B.; Guimpel, J.
Title (up) Magnetic coupling and magnetoresistance in La0.55Sr0.45MnO3/La0.67Ca0.33MnO3 multilayers Type Journal Article
Year 2003 Publication JOURNAL OF APPLIED PHYSICS Abbreviated Journal
Volume 93 Issue 10 Pages 6177-6181
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Abstract We have studied the interlayer coupling and the magnetoresistant effect of La0.55Sr0.45MnO3/La0.67Ca0.33MnO3 structures. Magnetization loops, measured in La0.55Sr0.45MnO3/La0.67Ca0.33MnO3/La0.55Sr0.45MnO3 trilayers, indicate that there is a ferromagnetic coupling of the La0.55Sr0.45MnO3 layers across the La0.67Ca0.33MnO3 spacer up to room temperature, even above the Curie temperature of the La0.67Ca0.33MnO3 layers. However, magnetization versus temperature curves present signatures of the magnetic ordering of both compounds. No extrinsic magnetoresistance associated with the multilayered structure was observed in the whole temperature range due to the presence of the interlayer ferromagnetic coupling. (C) 2003 American Institute of Physics.
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ISSN 0021-8979 ISBN Medium
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Notes ISI:000182789700049 Approved no
Call Number BT @ hernan @ Serial 169
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Author Sirena, M.; Haberkorn, N.; Granada, M.; Steren, L.B.; Guimpel, J.
Title (up) Metal-insulator transition induced by postdeposition annealing in low doped manganite films Type Journal Article
Year 2009 Publication JOURNAL OF APPLIED PHYSICS Abbreviated Journal
Volume 105 Issue 3 Pages
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Abstract We studied the transport and magnetic properties of low-doped manganite films after different oxygenation processes. The oxygen content was adjusted by postdeposition annealing at different oxygen pressures and annealing times. For all the samples we observed an increase in the Curie temperature and the remnant magnetization with the oxygen content. In general, for decreasing number of oxygen vacancies, samples under expansive strain become more homogeneous and their electrical resistivity decreases. A metal-insulator transition is induced in highly oxygenated films grown on SrTiO3, probably related to a shift of the mobility edge crossing below the Fermi energy. We found that the oxygenation dynamics depend critically on the strain field induced by the substrates and also on the Sr doping concentration.
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ISSN 0021-8979 ISBN Medium
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Notes ISI:000263409700057 Approved no
Call Number BT @ hernan @ Serial 143
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Author Ale Crivillero, M.V.; Amigó, M.L.; Haberkorn, N.; Nieva, G.; Guimpel, J.
Title (up) Microstructural control of the transport properties of β-FeSe films grown by sputtering Type Journal Article
Year 2019 Publication Journal of Applied Physics Abbreviated Journal Journal of Applied Physics
Volume 126 Issue 11 Pages 115303
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Publisher American Institute of Physics Place of Publication Editor
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Notes doi: 10.1063/1.5094131 Approved no
Call Number BT @ gnieva @ Serial 847
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Author Bauer, E.; Hauser, R.; Galatanu, A.; Lindbaum, A.; Hilscher, G.; Sassik, H.; Kirchmayr, H.; Sereni, J.G.; Rogl, P.
Title (up) New phase boundary between magnetic and non-Fermi-liquid in Ce(Rh1-xRux)(3)B-2, for 0 <= x <= 0.4 Type Journal Article
Year 1998 Publication Journal of Applied Physics Abbreviated Journal J. Appl. Phys.
Volume 83 Issue 11 Pages 6423-6425
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Abstract A study of the temperature-dependent magnetic susceptibility and electrical resistivity rho(T) (0.5-300 K) on single-phase alloys (CaCu5 type), prepared by argon are melting, reveals a magnetic phase transition with a nonmonotonous decrease of the ordering temperature from T-c = 115 K for x = 0 to T-c approximate to 0 for x = 0.40. A kink in the susceptibility at about 70 K indicates that ferromagnetism (at x < 0.1) transforms to a complex magnetic order for 0.125 less than or equal to x less than or equal to 0.35. Above that concentration rho(T) = rho(0) + AT(n) changes from n approximate to 2 to n approximate to 1.5, a characteristic for non-Fermi-liquid behavior. Under pressure T-c stays almost constant for x = 0.125 but dT(c)/dp grows with increasing Ru content. On the contrary, applied fields up to 12 T do not affect T-c. Low-temperature specific heat and ac susceptibility for x = 0.40 confirm the absence of long-range magnetic order down to 0.5 K, For x = 0.35 C-p/T = 62 mJ/mol K at 1.5 K, a value which is three times larger than that of CeRh3B2. (C) 1998 American Insitute of Physics. [S0021-8979(98)46511-3].
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Notes ISI:000077795500066 Approved no
Call Number BT @ hernan @ Serial 84
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