| Records |
| Author |
Luzuriaga, J. |
| Title |
Upper critical field in superconductors and the uncertainty principle: Upper limit to the maximum slope of Hc2 |
Type |
Journal Article |
| Year |
1990 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
42 |
Issue |
1 |
Pages  |
934-935 |
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| Abstract |
Consideration of the formulas that give the upper critical field Hc2 near the critical temperature Tc for superconductors in the dirty limit, together with the uncertainty principle, is shown to provide an upper limit to the maximum slope of Hc2. Analysis of reported values shows that amorphous superconductors are in this limit. |
| Address |
Centro Atmico, (8400) Bariloche, Argentina |
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| ISSN |
01631829 (ISSN) |
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| Notes |
Cited By (since 1996): 1; Export Date: 28 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.42.934; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Centro Atmico (8400) Bariloche, Argentina |
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no |
| Call Number |
BT @ luzuriag @ |
Serial |
490 |
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| Author |
Rodriguez, E.; Luzuriaga, J.; Núñez Regueiro, M.; Fainstein, C. |
| Title |
Low temperature internal friction peak in high Tc superconductors |
Type |
Journal Article |
| Year |
1991 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
77 |
Issue |
10 |
Pages |
777-780 |
| Keywords |
Ceramic Materials; Oxides – Acoustic Properties; Yttrium Compounds – Acoustic Properties; Acoustic Variables Measurement; Attenuation Peak; Calcium Compounds; Low Temperature Internal Friction Peak; Strontium Compounds; Thermally Activated Relaxation Behavior; High Temperature Superconductors |
| Abstract |
We measure the internal friction Q-1 in YBa2Cu3O7-x and Bi2Sr2CaCu2O8+x samples. At temperatures near 35 K for KHz frequencies we observe an attenuation peak. In the case of YBa2Cu3O7-x, assuming a thermally activated relaxation behaviour, we are able to show that it corresponds to the same process as other peaks observed at higher frequencies. For Bi2Sr2CaCu2O8+x this is not the case, and the origin of the peak, found in all the measured samples, remains unknown. |
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| ISSN |
0038-1098 |
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| Notes |
ISI:A1991FA71400006 |
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no |
| Call Number |
BT @ hernan @ |
Serial |
256 |
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| Author |
Luzuriaga, J.; D'Ovidio, C.; de la Cruz, F. |
| Title |
Ideal two dimensional flux pinning induced by annealing in superconducting amorphous Zr75Rh25 |
Type |
Journal Article |
| Year |
1986 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
57 |
Issue |
9 |
Pages |
753-756 |
| Keywords |
ZIRCONIUM COMPOUNDS – Physical Properties; CRITICAL CURRENT; FLUX PINNING; MELT SPINNING; PINNING FORCES; SUPERCONDUCTING MATRIX; SUPERCONDUCTING MATERIALS |
| Abstract |
By annealing amorphous Zr75Rh25 prepared by melt spinning an ideal behaviour of the critical current was observed, in which the measured pinning forces are seen to follow the two dimensional Larkin-Orchivnikov theory. In the region where this theory is valid the changes in the pinning forces can be explained by the changes in the superconducting matrix and it can be assumed that the pinning centers do not change with the heat treatment. |
| Address |
Centro Atomico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina |
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00381098 (ISSN) |
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Export Date: 28 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Centro Atomico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina |
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no |
| Call Number |
BT @ luzuriag @ |
Serial |
501 |
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| Author |
Herbsommer, J.A.; Nieva, G.; Luzuriaga, J. |
| Title |
Repetition of the disordered pattern in successive solidifications of vortex matter observed by Bitter decoration |
Type |
Journal Article |
| Year |
2000 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
62 |
Issue |
1 |
Pages |
678-681 |
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| Abstract |
Repeated images of the vortex structure in YBa2Cu3O7-delta Single crystals have been obtained, using the Bitter technique. By removing the iron dots between each decoration experiment, it is possible to image the vortices in different cooldown runs done under the same field and temperature conditions. The images show that these different realizations of a disordered vortex state found in twinned crystals are very similar at long range and differ only in small-scale detail. This is unusual behavior in glassy systems, where expectations are that successive configurations will differ over many scales. In contrast, ordered vortex crystals in clean samples can form with different orientations in different runs, therefore differing at long ranges. Double-sided decorations have been performed in twinned samples, and the correlation between images in both sides of the sample is similar in magnitude but slightly different qualitatively than that found in successive decorations. |
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0163-1829 |
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ISI:000088037000106 |
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no |
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BT @ hernan @ |
Serial |
225 |
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| Author |
Safar, H.; Durán, C.; Guimpel, J.; Civale, L.; Luzuriaga, J.; Rodríguez, E.; de la Cruz, F.; Fainstein, C.; Schneemeyer, L.F.; Waszczak, J.V. |
| Title |
Logarithmic to nonlogarithmic flux creep transition and magnetic flux hardening in BiSrCaCuO superconducting ceramics |
Type |
Journal Article |
| Year |
1989 |
Publication |
Physica C: Superconductivity |
Abbreviated Journal |
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| Volume |
162-164, Part 1 |
Issue |
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Pages |
665-666 |
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| Abstract |
A sharp temperature and field dependent transition from a logarithmic to a non-logarithmic flux creep behavior has been found in BiSrCaCuO superconductors. The transition is not followed by any noticeable change in the magnetization. However, vibrating reed measurements show that it coincides with a strong hardening of the magnetic structure. The transition occurs at fields and temperatures well below the reversibility line. The possible relation to the recently proposed flux lattice melting is discussed. |
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| ISSN |
0921-4534 |
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no |
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BT @ jguimpel @ |
Serial |
626 |
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| Author |
Giordano, J.L.; Luzuriaga, J.; Ruíz-Tagle,; NIEVA, G.; Badía-Majós, |
| Title |
Magnetization measurements of hard superconductors under dissipative transport |
Type |
Journal Article |
| Year |
2006 |
Publication |
Journal of Physics: Conference Series |
Abbreviated Journal |
J. Phys. Conf. Ser. |
| Volume |
43 |
Issue |
1 |
Pages |
663-666 |
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| Abstract |
The hysteretic magnetic flux dynamics of ceramic type-II superconductors under superimposed transport current cycles has been investigated. Field cooled and zero field cooled experiments were carried-out on polycrystalline YBa 2Cu3O7-x cylinders by using both temperature and applied field control, to drive the sample into the semi-reversible granular regime. The transport current magnitude was near and above the dissipative threshold. The interplay between shielding and transport due to vortex-pinning interactions, equilibrium magnetization effects, and diamagnetic/paramagnetic relaxation phenomena are shown to play an important role in the range of practical applications. |
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Departamento de F |
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17426588 (ISSN) |
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Export Date: 28 April 2009; Source: Scopus; Art. No.: 162; doi: 10.1088/1742-6596/43/1/162; Language of Original Document: English; Correspondence Address: Giordano, J.L.; Departamento de Ciencias de la Ingenier |
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no |
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BT @ luzuriag @ |
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471 |
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| Author |
Luzuriaga, J.; de la Cruz, F. |
| Title |
Reversible magnetization of surface superconductivity |
Type |
Journal Article |
| Year |
1978 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun |
| Volume |
25 |
Issue |
8 |
Pages |
605-607 |
| Keywords |
MAGNETIZATION; SUPERCONDUCTING MATERIALS |
| Abstract |
Direct measurements of the surface superconducting magnetization of the PbTl system shows that this state is a thermodynamic reversible one. |
| Address |
Centro Atómico Bariloche |
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00381098 (ISSN) |
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no |
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BT @ luzuriag @ |
Serial |
505 |
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| Author |
Durán, C.; Esquinazi, P.; Luzuriaga, J.; Brandt, E.H. |
| Title |
Bc1 of high-Tc La1.8Sr0.2CuO4 and amorphous Zr70Cu30 superconductors measured by a vibrating reed |
Type |
Journal Article |
| Year |
1987 |
Publication |
Physics Letters A |
Abbreviated Journal |
Phys. Lett. A |
| Volume |
123 |
Issue |
9 |
Pages |
485-488 |
| Keywords |
Zr70Cu30; ZIRCONIUM COPPER ALLOYS – Amorphous |
| Abstract |
The lower critical field Bc1 of the high-Tc superconductor La1.8Sr0.2CuO4 (Tc=40 K, Bcless-than-or-equals, slant7.7 mT) and of amorphous Zr70Cu30 (Tc=2.6K, Bc1less-than-or-equals, slant3.8 mT) is obtained from the resonance frequency ?/2? of a vibrating reed made of these materials. At applied magnetic fields Ba<Bc1, ?(Ba)=?i(Ba) as predicted for an ideally diamagnetic reed. Above Bc1 we observe a reversible linear law ?2??2inot, vert, similarB2a?B2c1. This allows a simple definition of Bc1 even in ceramic superconductors into which flux starts to penetrate at Bamuch less-thanBc1 due to their granular structure. |
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0375-9601 |
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| Notes |
ISI:A1987K407100012 |
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no |
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BT @ hernan @ |
Serial |
269 |
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| Author |
Konstantinov, D.; Homsi, W.; Luzuriaga, J.; Su, C.-K.; Weilert, M.A.; Maris, H.J. |
| Title |
How Does a Bubble Chamber Work? |
Type |
Journal Article |
| Year |
1998 |
Publication |
Journal of Low Temperature Physics |
Abbreviated Journal |
J. Low Temp. Phys. |
| Volume |
113 |
Issue |
3-4 |
Pages |
485-490 |
| Keywords |
Bubbles (in fluids); Charged particles; Helium; Hydrogen; Mathematical models; Vapor pressure; Bubble chamber; Saturated vapor pressure; Superfluid helium |
| Abstract |
A charged particle passing through a bubble chamber produces a track of bubbles. The way in which these bubbles are produced has been a matter of some controversy. We consider the possibility that in helium and hydrogen bubble chambers the production of bubbles is primarily a mechanical process, rather than a thermal process as has often been assumed. The model we propose gives results which are in excellent agreement with experiment. |
| Address |
CNEA, Centro Atomico, (8400) Bariloche, Argentina |
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00222291 (ISSN) |
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Cited By (since 1996): 6; Export Date: 28 April 2009; Source: Scopus; CODEN: JLTPA; Language of Original Document: English; Correspondence Address: Konstantinov, D.; Department of Physics; Brown University Providence, RI 02912, United States; References: Glaser, D.A., (1952) Phys. Rev., 87, p. 665; Glaser, D.A., (1953) Phys. Rev., 91, p. 762; Glaser, D.A., (1954) Nuovo Cimento, 11, p. 361; Seitz, F., (1958) Phys. Fluids, 1, p. 2; Tenner, A.G., (1962) Nucl. Inst. and Meths., 22, p. 1; Rosenblit, M., Jortner, J., (1995) Phys. Rev. Lett., 75, p. 4079; Classen, J., Su, C.-K., Mohazzab, M., Maris, H.J., (1998) Phys. Rev. B, 57, p. 3000; Akulichev, V.A., (1986) Ultrasonics, 24, p. 8; Aleksandrov, Y.A., (1968) Bubble Chambers, , Indiana, Bloomington |
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no |
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BT @ luzuriag @ |
Serial |
480 |
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| Author |
D'Anna, G.; Benoit, W.; Luzuriaga, J.; Berger, H. |
| Title |
Dynamic and static mechanical measurements of flux-lattice softening and associated hysteretic depinning dissipation peak in YBa2Cu3Ox ceramic |
Type |
Journal Article |
| Year |
1990 |
Publication |
Europhysics Letters |
Abbreviated Journal |
Europhys. Lett. |
| Volume |
13 |
Issue |
5 |
Pages |
465-471 |
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| Abstract |
We have studied flux-lattice dissipation in YBa2Cu3Ox ceramic using a forced inverted torsional pendulum. Reversible restoring force variations during temperature sweep suggest that flux lines experience a “hard-soft” transition between 50 K and Tc. Measurements of internal friction and modulus change as a function of the applied stress show a typical depinning behaviour. This dissipation peak during the temperature sweep is understood as a hysteretic depinning in which the critical force depends upon the penetration depth. |
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0295-5075 |
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ISI:A1990EG33100015 |
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no |
| Call Number |
BT @ hernan @ |
Serial |
259 |
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