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Author (up) Cecilia Blanco, M.; De Paoli, J.M.; Ceppi, S.; Tirao, G.; Nassif, V.M.; Guimpel, J.; Carbonio, R.E.
Title Synthesis, structural characterization and magnetic properties of the monoclinic ordered double perovskites BaLaMSbO6, with M = Mn, Co and Ni Type Journal Article
Year 2014 Publication Journal of Alloys and Compounds Abbreviated Journal
Volume 606 Issue Pages 139-148
Keywords Double perovskites; Magnetic properties; X-ray emission spectroscopy; Neutron powder diffraction
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Notes Approved no
Call Number BT @ jguimpel @ Serial 681
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Author (up) Fernandez, G.E.; Berisso, M.G.; Trovarelli, O.; Sereni, J.G.
Title Comparative study of the ferro-antiferromagnetic transition in Ce(Fe,Co)(2) and Ce(Fe,Al)(2) Type Journal Article
Year 1997 Publication Journal of Alloys and Compounds Abbreviated Journal J. Alloys Compd.
Volume 261 Issue 1-2 Pages 26-31
Keywords
Abstract The magnetic, thermal and transport properties of Ce(Fe,Co)(2) and Ce(Fe,Al)(2) around the ferro-antiferromagnetic (F-AF) transition are studied and compared in their thermodynamic aspects. We confirm the presence of a structural contribution to the enthalpy of the transition in the case of Co substitution, which is the main difference between the AF phase transitions in both systems. The role of the Ce hybridization in the Co case and the ''canted'' nature of the AF phase in Ce(Fe,Al)(2) are discussed. (C) 1997 Elsevier Science S.A.
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Notes ISI:A1997YE03600007 Approved no
Call Number BT @ hernan @ Serial 303
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Author (up) Luzuriaga, J.
Title Sphere on a vibrating reed for measurements of turbulence in superfluid helium Type Journal Article
Year 2000 Publication Journal of Alloys and Compounds Abbreviated Journal J Alloys Compd
Volume Issue Pages 265-268
Keywords Cantilever beams; Computational methods; Laminar flow; Oscillators (electronic); Phase transitions; Turbulent flow; Vibrations (mechanical); Oscillating spheres; Spherical geometries; Vibrating reeds; Superfluid helium
Abstract A modification of the vibrating reed, in which a massive sphere is made to oscillate at the end of a cantilevered beam, has been used for measurements in superfluid helium. The apparatus operates in the same way as a conventional vibrating reed with capacitive detection and drive. However, when operating submerged in the liquid, the frequency changes give information on the superfluid fraction, and the dissipation can be used to obtain information on the change of liquid flow, from laminar to turbulent. The spherical geometry allows an exact calculation of all parameters in the laminar regime, so departures due to the turbulence can be better quantified. The method has been found to work well in practice, and some measurements on the turbulent regime in the superfluid are presented.
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Publisher Elsevier Sequoia SA Place of Publication Buenos Aires, Argent Editor
Language Summary Language Original Title
Series Editor Series Title 12th International Conference on Internal Friction and Ultrasonic Attenuation in Solids (ICIFUAS-12) Abbreviated Series Title
Series Volume 310 Series Issue 1-2 Edition
ISSN 09258388 (ISSN) ISBN Medium
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Notes Conference code: 57483; Export Date: 28 April 2009; Source: Scopus; CODEN: JALCE; doi: 10.1016/S0925-8388(00)00962-2; Language of Original Document: English; Correspondence Address: Luzuriaga, Javier; Centro Atomico Bariloche Bariloche, Argentina; Sponsors: ABDUS SALAM International Centre for Theoretical Physics; Centre for Industrial Research (CINI); Comision Nacional de Actividades Espaciales (CONAE) Approved no
Call Number BT @ luzuriag @ Serial 478
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Author (up) Maple, M.B.; Lee, B.W.; Neumeier, J.J.; Nieva, G.; Paulius, L.M.; Seaman, C.L.
Title Hybridization, hole localization and pair breaking in the high Tc superconducting system Y1-xPrxBa2Cu3O7-δ Type Journal Article
Year 1992 Publication Journal of Alloys and Compounds Abbreviated Journal
Volume 181 Issue 1-2 Pages 135-152
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Abstract The Y1-xPrxBa2Cu3O7-δ (δ ≈ 0.05) system has a rich temperature—praseodymium concentration (T-x) phase diagram consisting of a metal—insulator transition at xcr≈0.6, high Tc superconductivity in the metallic phase (0x≤xcr), and antiferromagnetic ordering of the Cu2+ and praseodymium ions at Néel temperatures TN(Cu) >TN(Cu)>TN(Pr) in the insulating phase (xcr≤x1). In the metallic phase, Tc decreases monotonically with x and vanishes near xcr, the dependence of Tc on pressure P and the upper critical field on temperature are both anomalous, and the low temperature specific heat can be resolved into a large γΓ contribution, reminiscent of heavy fermion behavior, and a spin Kondo anomaly; in the insulating phase, the values of TN(Pr) are anomalously large. These phenomena are briefly reviewed within the framework of a picture that is based on appreciable hybridization of the praseodymium localized 4f states and the CuO2 valence band states. A phenomenological model that incorporates the annihilation of mobile holes in the CuO2 planes and superconducting electron pair breaking by the praseodymium ions can describe Tc (x,P) for x ≤ 0.2.
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Call Number BT @ gnieva @ Serial 440
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Author (up) Osquiguil, E.; Maenhoudt, M.; Wuyts, B.; Bruynseraede, Y.; Lederman, D.; Nieva, G.; Guimpel, J.; Schuller, I.K.
Title Photoexcitation effects in YBa2Cu3Ox Type Journal Article
Year 1993 Publication Journal of Alloys and Compounds Abbreviated Journal J Alloys Compd
Volume 195 Issue C Pages 667-670
Keywords Barium compounds; Ceramic materials; Copper oxides; High temperature superconductors; Oxides; Photoelectricity; Yttrium compounds; C-axis oriented films; Photoexcitation effects; Photoinduced phenomena; Yttrium barium cuprates; Superconducting films
Abstract We show through photoexcitation experiments carried out on YBa2Cu3Ox c-axis oriented films that photoinduced phenomena are not restricted to insulating samples. Superconducting films with critical temperatures varying between 2 K and 40 K show a clear enhancement of the superconducting transition after illumination. The increase in Tc is accompanied by a corresponding decrease in the resistivity ?, and an increase in the Hall coefficient RH, indicative of an increased carrier density. Furthermore, the carrier mobility is also affected by illumination.
Address Physics Department – 0319, University of California – San Diego, La Jolla, CA 92093-0319, United States
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Notes Cited By (since 1996): 4; Export Date: 17 April 2009; Source: Scopus; CODEN: JALCE; Language of Original Document: English; Correspondence Address: Osquiguil, E.; Laboratorium voor Vaste Stof-Fysika en Magnetisme; Katholieke Universiteit Leuven B-3001 Leuven, Belgium Approved no
Call Number BT @ osquigui @ Serial 401
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Author (up) Sanchez, R.D.; Causa, M.T.; Sereni, J.G.; Vallet-Regi, M.; Sayaguez, M.J.; Gonzalez-Calbet, J.M.
Title Specific heat, magnetic susceptibility and electrical resistivity measurements on LaNiO3 Type Journal Article
Year 1993 Publication Journal of Alloys and Compounds Abbreviated Journal J. Alloys Compd.
Volume 191 Issue 2 Pages 287–289
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Abstract Measurements of specific heat, magnetic susceptibility and electrical resistivity on LaNiO3 are reported. No evidence of magnetic ordering or metal-insulator transitions is found. From the measured electronic specific heat parameter γ and the Pauli susceptibility χP, a Stoner enhancement parameter is derived. Comparison with band structure calculations performed by other workers is also made.
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Call Number BT @ pedrazp @ Serial 691
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Author (up) SERENI, J.G.
Title SYSTEMATICS ON THE CERIUM MAGNETIC-TRANSFORMATIONS INDUCED BY ALLOYING Type Journal Article
Year 1994 Publication JOURNAL OF ALLOYS AND COMPOUNDS Abbreviated Journal
Volume 207 Issue Pages 229-236
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Abstract A systematic study on the competition between on-site and inter-site magnetic interactions is performed on Ce intermetallics through magnetic, thermal, transport, structural and spectroscopic measurements analyses. It is shown that the volume and the electronic concentration variation produced by alloying the Ce-ligand, are not equivalent and only the volume reduction. produces the maximum in the ordering temperature predicted by theory. For the magnetic to intermediate valence transformations, a change of regime is observed at a critical Ce-ligand substitution, which corresponds to a change in the substitution dependence of the experimental parameters. On the contrary, no change of regime is detected for the magnetic to heavy fermion transformation. The different regimes are correlated with the respective hybridization strengths of the ground and excited crystalline field states through the temperature dependence of the electrical resistivity. Such a correlation allows us to draw a generalized phase diagram containing these types of transformation.
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Notes ISI:A1994NU81500047 Approved no
Call Number BT @ hernan @ Serial 104
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Author (up) Sutter, J.G.; Chávez, A.S.; Soria, S.; Granada, M.; Neñer, L.; Bengió, S.; Granell, P.; Golmar, F.; Haberkorn, N.; Leyva, A.G.; Sirena, M.
Title Tuning the magneto-electrical properties of multiferroic multilayers through interface strain and disorder Type Journal Article
Year 2020 Publication Journal of Alloys and Compounds Abbreviated Journal J. Alloys Compd.
Volume Issue Pages 157820
Keywords multiferroic; superlattices; manganites; magnetism; disorder
Abstract Artificially engineered superlattices were designed and fabricated to induce different growth mechanisms and structural characteristics. DC sputtering was used to grow ferromagnetic (La0.8Ba0.2MnO3)/ferroelectric (Ba0.25Sr0.75TiO3 or BaTiO3) superlattices. We systematically modified the thickness of the ferromagnetic layer to analyze dimensional and structural disorder effects on the superlattices with different structural characteristics. The crystalline structure was characterized by X-ray diffraction and transmission electron microscopy. The magnetic and electronic properties were investigated by SQUID magnetometry and resistance measurements. The results show that both strain and structural disorder can significantly affect the physical properties of the systems. Ba0.25Sr0.75TiO3 based superlattices with a low thickness of the ferromagnetic layers (4 nm.) present compressive strain that decreases the ferromagnetic transition temperature from 250 K corresponding to the unstressed samples to 230 K. In these samples, the localization energy of the charge carrier through the electron-phonon interaction decreases at low temperatures (∼100 meV). Ba0.25Sr0.75TiO3 based superlattices with thicknesses of the ferromagnetic layers higher than 12 nm present tensile strain that reduces the charge carrier localization energy at low temperatures (∼1 meV), increasing the ferromagnetic transition temperature (Tc∼265K). Structural defects in BaTiO3 based superlattices have a stronger influence on the magnetic properties than on the transport properties. Nevertheless, disorder blocks the ferromagnetic transition for highly disordered samples (thickness of the ferromagnetic layer < 3 nm). These results help to further understand the role of strain and interface effects in the magnetic and transport properties of manganite based multiferroic systems.
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Notes Approved no
Call Number BT @ pedrazp @ Serial 861
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Author (up) Sutter, J.G.; Sarmiento Chávez, A.; Soria, S.; Granada, M.; Neñer, L.; Bengió, S.; Granell, P.; Golmar, F.; Haberkorn, N.; Leyva, A.G.; Sirena, M.
Title Tuning the magneto-electrical properties of multiferroic multilayers through interface strain and disorder Type Journal Article
Year 2021 Publication Journal of Alloys and Compounds Abbreviated Journal J. Alloys Compd.
Volume 859 Issue Pages 157820
Keywords
Abstract Artificially engineered superlattices were designed and fabricated to induce different growth mechanisms and structural characteristics. DC sputtering was used to grow ferromagnetic (La0.8Ba0.2MnO3)/ferroelectric (Ba0.25Sr0.75TiO3 or BaTiO3) superlattices. We systematically modified the thickness of the ferromagnetic layer to analyze dimensional and structural disorder effects on the superlattices with different structural characteristics. The crystalline structure was characterized by X-ray diffraction and transmission electron microscopy. The magnetic and electronic properties were investigated by SQUID magnetometry and resistance measurements. The results show that both strain and structural disorder can significantly affect the physical properties of the systems. Ba0.25Sr0.75TiO3 based superlattices with a low thickness of the ferromagnetic layers (4 nm) present compressive strain that decreases the ferromagnetic transition temperature from 250 K corresponding to the unstressed samples to 230 K. In these samples, the localization energy of the charge carrier through the electron-phonon interaction decreases at low temperatures (∼100 meV). Ba0.25Sr0.75TiO3 based superlattices with thicknesses of the ferromagnetic layers higher than 12 nm present tensile strain that reduces the charge carrier localization energy at low temperatures (∼1 meV), increasing the ferromagnetic transition temperature (Tc∼265 K). Structural defects in BaTiO3 based superlattices have a stronger influence on the magnetic properties than on the transport properties. Nevertheless, disorder blocks the ferromagnetic transition for highly disordered samples (thickness of the ferromagnetic layer < 3 nm). These results help to further understand the role of strain and interface effects in the magnetic and transport properties of manganite based multiferroic systems.
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Publisher Place of Publication Editor
Language Summary Language Original Title
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ISSN 0925-8388 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 874
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Author (up) Trovarelli, O.; Gomez-Berisso, M.; Pedrazzini, P.; Bosse, D.; Geibel, C.; Sereni, J.G.; Steglich, F.
Title Metallurgic, structural and magnetic properties of Ce(Pd1-rRhr)(2)Si-2 Type Journal Article
Year 1998 Publication JOURNAL OF ALLOYS AND COMPOUNDS Abbreviated Journal
Volume 275 Issue Pages 569-573
Keywords
Abstract We report on investigations of the metallurgic, crystallographic and magnetic properties of the Ce(Pd1-rRhr)(2)Si-2 system. While the as-cast samples show a miscibility gap for 0.3<r<0.7, complete miscibility with a monotonous evolution of the lattice parameters is found in samples annealed at 1200 degrees C. Although both pure compounds order antiferromagnetically at 10 K (r=0) and 36 K (r=1) respectively, our magnetic susceptibility (chi) results indicate a magnetically non-ordered state at intermediate concentrations. The ordering temperature decreases smoothly and continuously on the Pd-rich side, vanishing between r=0.2 and r=0.3. On the Rh-rich side, this decrease is faster and at r=0.8 the long-range magnetic order is replaced by enhanced magnetic fluctuations as evidenced by a broad maximum in chi(T) around 25 K. The orientation-dependent chi of the strongly textured samples indicates an evolution towards an easy-axis system with increasing Rh content. The results are discussed and compared to the related systems Ce(Pd1-xTx)(2)Si-2 (T=Ru and Cu). (C) 1998 Elsevier Science S.A.
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Notes ISI:000075617700123 Approved no
Call Number BT @ hernan @ Serial 85
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