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Author (up) Ale Crivillero, M.V.; Amigó, M.L.; Haberkorn, N.; Nieva, G.; Guimpel, J.
Title 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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Corporate Author Thesis
Publisher American Institute of Physics Place of Publication Editor
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Series Volume Series Issue Edition
ISSN 0021-8979 ISBN Medium
Area Expedition Conference
Notes doi: 10.1063/1.5094131 Approved no
Call Number BT @ gnieva @ Serial 847
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Author (up) Bauer, E.; Hauser, R.; Galatanu, A.; Lindbaum, A.; Hilscher, G.; Sassik, H.; Kirchmayr, H.; Sereni, J.G.; Rogl, P.
Title 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
Keywords
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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ISSN 0021-8979 ISBN Medium
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Notes ISI:000077795500066 Approved no
Call Number BT @ hernan @ Serial 84
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Author (up) El-Khatib, S.; Alsmadi, A.M.; Correa, V.; Andreev, A.V.; Lacerda, A.; Nasreen, F.; Nakotte, H.
Title 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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Corporate Author Thesis
Publisher AIP Place of Publication Editor
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Notes Approved no
Call Number BT @ hernan @ Serial 306
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Author (up) Haberkorn, N.; Guimpel, J.; Steren, L.B.; Campillo, G.; Saldarriaga, W.; Gomez, M.E.
Title Structure of high-T-c/manganite perovskite superlattices Type Journal Article
Year 2003 Publication JOURNAL OF APPLIED PHYSICS Abbreviated Journal
Volume 94 Issue 5 Pages 3011-3014
Keywords
Abstract We study the crystalline and interface structure of RBa2Cu3O7/La(1-x)A(x)MnO(3) superlattices (R=Y, Gd; A=Ca, Sr) grown on mismatched MgO substrates by means of nondestructive x-ray diffraction. The diffraction patterns are adjusted to a model of the structure which includes interface roughness and interdiffusion. Our results show that these disorder mechanisms cannot be neglected and should be taken into account to understand the physical properties of these superlattice. (C) 2003 American Institute of Physics.
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ISSN 0021-8979 ISBN Medium
Area Expedition Conference
Notes ISI:000184844200032 Approved no
Call Number BT @ hernan @ Serial 167
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Author (up) Haberkorn, N.; Lovey, F.; Condo, A.M.; Guimpel, J.
Title 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
Keywords
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 (up) Navarro, H.; Yang, I.; Sirena, M.; Kim, J.; Haberkorn, N.
Title 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
Keywords
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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Notes Approved no
Call Number BT @ pedrazp @ Serial 727
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Author (up) Ogando, K.; Pastoriza, H.
Title 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
Keywords
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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Notes Approved no
Call Number BT @ hernan @ Serial 718
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Author (up) Osquiguil, E.; Tosi, L.; Kaul, E.E.; Balseiro, C.A.
Title On the origin of the low temperatures resistivity minimum in Cr thin films Type Journal Article
Year 2013 Publication Journal Of Applied Physics Abbreviated Journal J. Appl. Phys.
Volume 114 Issue 24 Pages 7 pp
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Abstract We present measurements of the electrical resistivity and Hall coefficient, p and R-H, in Cr films of different thicknesses grown on MgO (100) substrates, as a function of temperature T and applied magnetic field H. The results show a low temperature minimum in rho(T), which is thickness dependent. From 40K to 2K, the Hall coefficient is a monotonous increasing function as T is reduced with no particular signature at the temperature T-min, where the minimum develops. We explain the resistivity minimum assuming an imperfect nesting of the Fermi surface leading to small electron and hole pockets. We introduce a phenomenological model which supports this simple physical picture. (C) 2013 AI Publishing LLC.
Address [Osquiguil, E.] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
Corporate Author Thesis
Publisher Amer Inst Physics Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN 0021-8979 ISBN Medium
Area Expedition Conference
Notes WOS:000329173200042 Approved no
Call Number BT @ hernan @ Serial 682
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Author (up) Sereni, J.G.; Schlottmann, P.
Title Tb impurities in Th: A Kondo system with undercompensated magnetic moment? Type Journal Article
Year 1996 Publication Journal of Applied Physics Abbreviated Journal J. Appl. Phys.
Volume 79 Issue 8 Pages 6417-6419
Keywords
Abstract Dilute TbxTh1-x alloys have been thoroughly studied in the light of a possible valence instability and Kondo effect in Tb3+ and Tb4+ ions. We review the experimental data for the specific heat, magnetic susceptibility, magnetization, magnetoresistivity, and the change of the superconducting properties of Th. In analogy to Tm (Tm2+ and Tm3+) and Pr (Pr3+ and Pr4+) impurities in metals, Tb involves two electronic configurations each with a magnetic Hund's rule ground multiplet. Two classes of models for valence admixtures of two magnetic configurations have been investigated in the past. Depending on the form of the hybridization and the jj coupling within the 4f shell, the models either have a singlet or a magnetic ground state. As for Tm impurities the latter class of models, related to the undercompensated Kondo effect, appears to describe the system TbTh more appropriately A qualitative explanation of the data is attempted within a scheme that combines Kondo screening with crystalline field splitting.
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ISSN 0021-8979 ISBN Medium
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Notes ISI:A1996UG87800306 Approved no
Call Number BT @ hernan @ Serial 97
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Author (up) Sirena, M.; Haberkorn, N.; Granada, M.; Steren, L.B.; Guimpel, J.
Title 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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Notes ISI:000263409700057 Approved no
Call Number BT @ hernan @ Serial 143
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