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Author |
Kappler, J.P.; Besnus, M.J.; Haen, P.; Sereni, J.G. |
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Title |
Ce ground state in CePd1-xNix |
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Journal Article |
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Year |
1997 |
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Physica B: Condensed Matter |
Abbreviated Journal |
Physica B |
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230-232 |
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162-164 |
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Abstract |
Alloying ferromagnetic CePd (Tc = 6.5 K) with the intermediate valence compound CeNi compresses the lattice, though the ferromagnetic order is present up to x = 0.94 in CePd1−xNix. We report here the competition of magnetic order and Kondo effect, through specific heat, magnetization and resistivity measurements. Detailed results gathered on the x = 0.95 sample show several features suggesting a non-Fermi liquid behaviour which may be due to the proximity to magnetic order: ϱ = ϱ0 + AT1.1 (3 < T ⩽ 30 K) and C/T ∠− ln T(T ⩾ 0.9 K). At lower temperatures C/T tends to saturate at a value of 0.225 J/K2 mol, about three times the value observed for CeNi. |
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BT @ pedrazp @ |
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688 |
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Author |
Sereni, J.G.; Geibel, C.; Berisso, M.G.; Hellmann, P.; Trovarelli, O.; Steglich, F. |
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Title |
Scaling of the ''C-p proportional to TlnT'' dependence in Ce systems |
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Journal Article |
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1997 |
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Physica B – Condensed Matter |
Abbreviated Journal |
Physica B |
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230-232 |
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580-582 |
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We analyze the T ln T dependence of the specific heat (C-p) in several Ce binaries and ternaries. We find that these systems can be directly compared by using a scaling law of the type: C-p/t = -D log t + ET0, where t = T/T-0, with the scaling temperature T-0 similar to T-K, D = 7.2 J/(mol K) and 0 < E < 0.14 J/(mol K-2). This general function describes those systems within the 0.005 < t < 0.5 range and accounts for nearly 1/2 of the expected entropy of the Ce-doublet. |
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0921-4526 |
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ISI:A1997WW40300168 |
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BT @ hernan @ |
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93 |
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Trovarelli, O.; Sereni, J.G.; Kappler, J.P. |
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Title |
Role of Ce sublattices in the thermal and magnetic properties of Ce7X3 (X=Ni, Ru, Rh, Ir, Pd, and Pt) compounds |
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Journal Article |
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1997 |
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Journal of Low Temperature Physics |
Abbreviated Journal |
J. Low. Temp. Phys. |
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108 |
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1-2 |
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53-85 |
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The role of the Ce sublattices in the thermal and magnetic properties of the Ce7X3 (X = Ni, Ru, Rh, Ir, Pd, and Pt) family of compounds is studied by means of ac and dc magnetic susceptibility, mngnetization and mainly specific-heat experiments in applied magnetic field. The experimental data show that in these compounds there is coexistence of magnetic order, heavy-fermion and intermediate-valence behavior, which is interpreted in terms of the contribution of the three different sublattices present in the crystalline structure of Th7Fe3-type (denoted by 1Ce(I), 3Ce(II) and 3Ce(III)). From the available volume of the Ce-III atoms in their crystallographic environment it is found that sublattice Ce-III has an intermediate-valence behavior, whereas from entropic considerations sublattices Ce-I and Ce-II are identified as responsible for the magnetic order or heavy-fermion behavior, depending on the Ce-ligand electronic structure. This systematics evidences a clear correlation between the thermal and magnetic properties of these compounds and the position of the respective Ce-ligands in the periodic table, through the particular sensitivity of Ce to the environmental conditions. |
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0022-2291 |
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ISI:A1997XK19200004 |
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BT @ hernan @ |
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92 |
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Author |
Luzuriaga, J. |
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Title |
Measurements in the laminar and turbulent regime of superfluid4He by means of an oscillating sphere |
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Journal Article |
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Year |
1997 |
Publication |
Journal of Low Temperature Physics |
Abbreviated Journal |
J. Low Temp. Phys. |
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108 |
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3-4 |
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267-277 |
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Calculations; Laminar flow; Oscillations; Spheres; Turbulence; Turbulent flow; Vibrations (mechanical); Oscillating sphere; Translational oscillation; Superfluid helium |
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The translational oscillations of a sphere in liquid helium have been measured as a way of studying superfluid turbulence. Experiments were carried out in the laminar flow regime for reference purposes, and good agreement found between measured and calculated quantities. In the turbulent region, the dissipation is found to be proportional to the square of the velocity of the sphere, as found previously by other workers. For high vibration amplitudes there is an increase in the hydrodynamic mass. This seems to scale with the superfluid fraction in a way that strongly suggests that the superfluid component plays an important role in the turbulent regime. |
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Comisi |
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00222291 (ISSN) |
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Cited By (since 1996): 2; Export Date: 28 April 2009; Source: Scopus; CODEN: JLTPA; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Comisi |
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518 |
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Fernandez, G.E.; Berisso, M.G.; Trovarelli, O.; Sereni, J.G. |
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Title |
Comparative study of the ferro-antiferromagnetic transition in Ce(Fe,Co)(2) and Ce(Fe,Al)(2) |
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Journal Article |
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Year |
1997 |
Publication |
Journal of Alloys and Compounds |
Abbreviated Journal |
J. Alloys Compd. |
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261 |
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1-2 |
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26-31 |
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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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0925-8388 |
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ISI:A1997YE03600007 |
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BT @ hernan @ |
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303 |
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Author |
Pardo, Flavio |
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Title |
Estructura estática y dinámica de la red de vórtices : decoración magnética y otras técnicas experimentales |
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1997 |
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Ph.D. thesis |
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BT @ hernan @ |
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325 |
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Author |
Goffman, Marcelo F. |
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Title |
Vórtices en superconductores laminares de alta temperatura crítica |
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1997 |
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Ph.D. thesis |
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BT @ hernan @ |
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323 |
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