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Author Civale L.; Martinez, E. N.
Title Linear temperature dependence of the resistivity in the new superconductors Type Journal Article
Year 1988 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume (up) 38 Issue 1 Pages 928-930
Keywords
Abstract We present an elementary proof that, irrespective of dimensionality, the electrical resistivity of a simple conductor should be linear with temperature for T>2PFS / kB??D if PF?h? / a, where PF is the Fermi momentum, s the speed of sound, a the lattice constant, and ?D the Debye temperature.
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Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ pedrazp @ 10.1103/PhysRevB.38.928 Serial 575
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Author Kappler, J.P.; Lehmann, P.; Schmerber, G.; Nieva, G.; Sereni, J.G.
Title Magnetic properties of the Ce-Rh binary phases Type Journal Article
Year 1988 Publication Journal de Physique Colloques Abbreviated Journal
Volume (up) 49 Issue C8 Pages 721-722
Keywords
Abstract Crystallographic, magnetic and resistivity studies on the Ce-Rh binary phases clearly define two Ce ground state regions : i) CeRh3, CeRh2 and CeRh as intermediate valence compounds and ii) Ce5Rh4, Ce3Rh2 Ce5Rh3 and Ce7Rh3 with magnetic transitions at low temperature.
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Series Volume Series Issue Edition
ISSN 0302-0738 ISBN Medium
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Notes ISI:A1988U701200329 Approved no
Call Number BT @ hernan @ Serial 122
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Author Kappler, J.P.; Beaurepaire, E.; Krill, G.; Godart, C.; Nieva, G.; Sereni, J.G.
Title Magnetic to non-magnetic transition of Ce induced by volume in Ce(Pd, Ni) and electron concentration in Ce(Pd, Rh) Type Journal Article
Year 1988 Publication Journal de Physique Colloques Abbreviated Journal
Volume (up) 49 Issue C-8 Pages 723-724
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Abstract Unit cell volume, magnetic properties and LIII X-ray absorption edge studies in Ce(Pd, M) with M = Ni or Rh show that the Ce demagnetization is mainly driven by volume reduction in Ce(Pd, Ni) and essentially due to the reduction of the d electron number in Ce(Pd, Rh).
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ISSN 0302-0738 ISBN Medium
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Notes ISI:A1988U701200330 Approved no
Call Number BT @ hernan @ Serial 123
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Author Kappler, J. P.; Nieva, G.; Sereni, J.G.; Souletie, J.
Title Static Scaling in the CePd3Bx Kondo system Type Journal Article
Year 1988 Publication Journal de Physique Colloques Abbreviated Journal J. Phys. Colloques
Volume (up) 49 Issue C-8 Pages 725-726
Keywords
Abstract The static scaling hypothesis for continuous transitions, extended to cases where Tc < 0, has appropriate features to describe heavy fermions. We present here the application of this model to the specific-heat and susceptibility anomalies for the concentrated Kondo system CePd3Bx (x = 0.4 and 1).
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Call Number BT @ gnieva @ Serial 434
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Author Osquiguil, E.; Decca, R.; Nieva, G.; Civale, L.; de la Cruz, F.
Title La1.80 Sr0.20 CuO4-delta a clean limit superconductor Type Journal Article
Year 1988 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume (up) 65 Issue 6 Pages 491-494
Keywords CERAMIC MATERIALS; LANTHANUM COMPOUNDS – Electric Conductivity; CERAMIC SUPERCONDUCTORS; CLEAN LIMIT SUPERCONDUCTOR; HIGH-TEMPERATURE SUPERCONDUCTORS; OXYGEN CONCENTRATION; SUPERCONDUCTING MATERIALS
Abstract The electrical resistivity of the superconductor La1.80Sr0.20Cu04-? has been measured in a wide range of temperatures as a function of oxygen and vacuum heat treatments. The resistivity changes reversibly orders of magnitude with oxygen concentration. There is no sign of saturation at high temperatures, even for samples where the resistivity is increased by heat treatment in vacuum. Using the experimental data and general arguments it is concluded that the ceramic superconductors are high ? materials in the clean limit.
Address Instituto Balseiro 8400 Bariloche, R.N., Argentina# # Comisi
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ISSN 00381098 (ISSN) ISBN Medium
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Notes Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Osquiguil, E. Approved no
Call Number BT @ osquigui @ Serial 416
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Author Durán, C.; Esquinazi, P.; Fainstein, C.; Núñez Regueiro, M.
Title Anomalies in the internal friction and sound velocity in YBa2Cu3O7-x and EuBa2Cu3O7-x superconductors Type Journal Article
Year 1988 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume (up) 65 Issue 9 Pages 957-961
Keywords
Abstract Internal friction Q-1 and Young Modulus sound velocity vE measurements at 1 kHz in YBa2Cu3O7?x and EuBa2Cu3O7?x polycrystalline samples reveal anomalies at the superconducting transition and at not, vert, similar37 K. The anomaly in vE at not, vert, similar90 K is accompanied by an absorption peak and is in agreement with published ultrasonic measurements, suggesting a lattice deformation at the superconducting transition.
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ISSN 0038-1098 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 569
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Author Braun, E.; Bürger, A.; Roden, B.; Sereni, J.G.
Title Spin glass-like behaviour of the singlet ground state system: ThTb Type Journal Article
Year 1988 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume (up) 66 Issue 11 Pages 1141-1144
Keywords
Abstract We have studied the temperature and field dependence of the magnetic susceptibility, X, on the single-ground-state Th1?nTbn system, in the 0.2 < n < 0.6 concentration range. The characteristic maximum of a spin glass transition was found at a temperature Tg, which increases linearly with the impurity concentration. As expected, the maximum of X is reduced by the increment of the applied magnetic field. The spin glass order parameter, as well as its critical exponent were evaluated by using the Sherrington-Kirkpatrick theory.
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ISSN 0038-1098 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 577
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Author Núñez Regueiro, M.; Izbizky, M.A.; Esquinazi, P.
Title Thermal conductivity and “disorder” in high temperature superconductors Type Journal Article
Year 1988 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume (up) 67 Issue 4 Pages 401-404
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Abstract We analyze the controversial thermal conductivity results on high temperature superconductors by scaling the data with material parameters to compare them to other materials with similar behaviour. We show that they have the same general features observed in amorphous and disordered crystalline materials. Possible origins of the disorder are discussed.
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ISSN 0038-1098 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 583
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Author NIEVA, G.L.; SERENI, J.G.; AFYOUNI, M.; SCHMERBER, G.; KAPPLER, J.P.
Title FROM FERROMAGNETIC TO NON-MAGNETIC SINGLET GROUND-STATE IN CEPD1-XNIX Type Journal Article
Year 1988 Publication Zeitschrift für Physik B Condensed Matter Abbreviated Journal Z. Phys. B
Volume (up) 70 Issue 2 Pages 181-186
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Abstract
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0722-3277 ISBN Medium
Area Expedition Conference
Notes ISI:A1988M112900008 Approved no
Call Number BT @ hernan @ Serial 126
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Author Braun, E.; Bürger, A.; Nieva, G.L.; Roden, B.; Sereni, J.G.
Title Unexpected magnetic behaviour in a singlet crystal field ground state induced by Tb 4f-instability Type Journal Article
Year 1988 Publication Zeitschrift für Physik B Condensed Matter Abbreviated Journal Z. Phys. B
Volume (up) 70 Issue 2 Pages 187-192
Keywords
Abstract The magnetic susceptibility (chi) of Th1-x Tb x alloys (with 5<x<55a/o Tb) in the range of 1 K<T<350K and the specific heat (forx=1.5a/o Tb) for 0.5<T<10 K were measured. A maximum in chi(T) was observed at a temperature which depends on concentration. The crystal field level scheme that fits the specific heat measurements shows two non-magnetic singlets as lowest levels. Such ambiguity is discussed within the framework of the 4f-Tb instability. The results are in agreement with the matrix superconductiveT c decrease. The contribution of the interconfigurational mixing on chi and the specific heat is also discussed.
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Publisher Place of Publication Editor
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0722-3277 ISBN Medium
Area Expedition Conference
Notes ISI:A1988M112900009 Approved no
Call Number BT @ hernan @ Serial 127
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