| Records |
| Author |
Pardo, Flavio |
Title  |
Estructura estática y dinámica de la red de vórtices : decoración magnética y otras técnicas experimentales |
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Journal Article |
| Year |
1997 |
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Ph.D. thesis |
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no |
| Call Number |
BT @ hernan @ |
Serial |
325 |
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| Author |
Righi, E.F.; Grigera, S.A.; Lopez, D.; Nieva, G.; delaCruz, F.; Civale, L.; Pasquini, G.; Levy, P. |
| Title |
Enhancement of c-axis vortex correlation by twin boundaries and columnar defects in YBa2Cu3O7-delta |
Type |
Journal Article |
| Year |
1997 |
Publication |
PHYSICAL REVIEW B |
Abbreviated Journal |
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| Volume |
55 |
Issue |
9 |
Pages |
5663-5665 |
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| Abstract |
We report on transport measurements using the flux transformer configuration in a twinned single crystal of YBa2Cu3O7-delta with columnar defects. The vortex liquid shows velocity correlation along the c axis (the direction of the applied magnetic field and the columnar defects) at temperatures that correspond to an uncorrelated liquid in unirradiated samples of the same thickness. These results and previous work about the effect of twin boundaries on vortex velocity correlation show that phase coherence in the field direction is not an intrinsic property of vortex liquids but one induced by extended defects. |
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| ISSN |
0163-1829 |
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| Notes |
ISI:A1997WN21800036 |
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no |
| Call Number |
BT @ hernan @ |
Serial |
242 |
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| Author |
Pardo, F.; Mackenzie, A.P.; delaCruz, F.; Guimpel, J. |
| Title |
Effect of the reversibility region on the low-temperature vortex structure imaged by Bitter magnetic decoration |
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Journal Article |
| Year |
1997 |
Publication |
PHYSICAL REVIEW B |
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| Volume |
55 |
Issue |
21 |
Pages |
14610-14613 |
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| Abstract |
We have combined magnetic measurements and imaging of the vortex lattice at low fields in Tl2Ba2CuO6-delta single crystals with different oxygen content. Those with high critical temperature T-c > 80 K have a reversible region while those with low T-c < 30 K have an irreversible magnetization in the whole range of temperatures, up to T-c. The presence of the reversible region allows the formation of ordered vortex structures, while amorphous structures are obtained when no reversible region is present below T-c. The results are discussed in terms of vortex nucleation processes in the individual pinning regime. |
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0163-1829 |
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| Notes |
ISI:A1997XE37100086 |
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no |
| Call Number |
BT @ hernan @ |
Serial |
187 |
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| Author |
Sereni, J.G.; Trovarelli, O.; Schmerber, G.; Kappler, J.P. |
| Title |
Comparative study of thermal and magnetic properties of CeTyX4-y ferromagnets |
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Journal Article |
| Year |
1997 |
Publication |
Physical Review B – Condensed Matter and Materials Physics |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
56 |
Issue |
9 |
Pages |
5380-5386 |
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Low-temperature thermal (specific heat, C-P) and magnetic [ac susceptibility, chi(ac), and isothermal magnetization M(B)] measurements on CeTyX4-y ferromagnets (with T = Ni, Cu, Pd, Ag, Au, and X = Ga, Al, with 0.3 < y < 0.7) are reported. With the exception of T = Ni, all compounds with X = Ga show a typical second-order ferromagnetic transition. In the case of T = Ni, magnetic correlations set in at T approximate to 3T(C), (T-C being the Curie temperature) and the C-P(T) and chi(ac)(T) maxima (at 3.3 and 4.2 K, respectively) do not coincide, while the M(B) curves reveal an antiferromagnetic character at lower temperatures. In these systems, the magnetic entropy of the ordered phase is larger than 85% of Rln2, in coincidence with the low values of the Sommerfeld coefficient gamma less than or equal to 10 mJ/mol K-2. For T = Ag and X = Al, a strong diamagnetic signal was observed at T-s = 0.63 K in chi(ac)(T), with the characteristics of a superconducting component. The thermodynamical properties of these compounds confirm the lack of hybridization when the Ce atom is in a ferromagnetic ground state. |
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0163-1829 |
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| Notes |
ISI:A1997XW94200062 |
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no |
| Call Number |
BT @ hernan @ |
Serial |
89 |
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| Author |
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) |
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Journal Article |
| Year |
1997 |
Publication |
Journal of Alloys and Compounds |
Abbreviated Journal |
J. Alloys Compd. |
| Volume |
261 |
Issue |
1-2 |
Pages |
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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| Notes |
ISI:A1997YE03600007 |
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no |
| Call Number |
BT @ hernan @ |
Serial |
303 |
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| Author |
Kappler, J.P.; Besnus, M.J.; Haen, P.; Sereni, J.G. |
| Title |
Ce ground state in CePd1-xNix |
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Journal Article |
| Year |
1997 |
Publication |
Physica B: Condensed Matter |
Abbreviated Journal |
Physica B |
| Volume |
230-232 |
Issue |
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Pages |
162-164 |
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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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no |
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BT @ pedrazp @ |
Serial |
688 |
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| Author |
Morré, E.; Grigera, S.; Osquiguil, E.; Nieva, G.; de la Cruz, F. |
| Title |
Angular restrictions on the glass transition and on the c-axis correlated liquid phase in twinned YBa2Cu3O7-? |
Type |
Journal Article |
| Year |
1997 |
Publication |
Physics Letters A |
Abbreviated Journal |
Phys. Lett. A |
| Volume |
233 |
Issue |
1-2 |
Pages |
130-134 |
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| Abstract |
We have measured the angular dependence of the vortex velocity correlation temperature Tth(H) in twinned YBa2Cu3O7-? single crystals. The data show that the c-axis correlated vortex liquid phase exists up to angles much larger than expected within a single vortex pinning picture. Despite this, the second-order solid-liquid glass transition is shown to be restricted only to external magnetic fields applied within a few degrees from the c-axis direction. |
| Address |
Centro Atómico Bariloche |
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03759601 |
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| Notes |
Cited By (since 1996): 13; Export Date: 17 April 2009; Source: Scopus; CODEN: PYLAA; Language of Original Document: English; Correspondence Address: Morr |
Approved |
no |
| Call Number |
BT @ osquigui @ |
Serial |
381 |
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