| Records |
| Author |
Nieva,G.; Martinez, E. N.; de la Cruz, F.; Esparza, D. A.; D'Ovidio, C. A. |
| Title |
Specific heat of La1.8Sr0.2CuO4: Anomaly at the superconducting transition |
Type |
Journal Article |
| Year |
1987 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
36 |
Issue |
16 |
Pages |
8780 - 8782 |
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426 |
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| Author |
Osquiguil, E.; Civale, L.; Decca, R.; Safar, H.; Martinez, E.; Nieva, G.; de la Cruz, F. |
| Title |
The Granular Behavior of LaSrCuO: Oxygen Concentration Effects on the Electrical Resistivity |
Type |
Book Chapter |
| Year |
1988 |
Publication |
High Temperature Superconductors, Mat. Res. Soc. Symposium Proceedings |
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| Volume |
99 |
Issue |
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Pages |
985 |
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| Publisher |
Mater. Res. Soc. |
Place of Publication |
Pittsburgh, PA |
Editor |
ed. M.B. Brosdky, R. C. Dynes, K. Kitazawa and H. L. Tutler |
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431 |
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| Author |
López, D.; Rodríguez, E.; Nieva, G.; de la Cruz, F.; Cheong, S. W. |
| Title |
Three-dimensional vortex flux flow in LSCO and YBCO through pseudo dc flux transformer measurements |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physica B: Condensed Matter |
Abbreviated Journal |
Physica B |
| Volume |
194-196 |
Issue |
2 |
Pages |
1977-1978 |
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| Abstract |
A pseudo dc flux transformer configuration shows that the flux flow in La2−xSrxCuO4 (x=0.075) and YBa2Cu3O7 single crystals is due to the movement of 3-D vortices across the sample. We show that the loss of c-axis long range vortex correlation is achieved either by thermal fluctuations or by an inhomogeneus Lorentz force acting on the vortices. |
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BT @ gnieva @ |
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442 |
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Safar, H.; Gammel, P.L.; Huse, D.A.; Majumdar, S.N.; Schneemeyer, L.F.; Bishop, D.J.; Lopez, D.; Nieva, G.L.; de la Cruz, F. |
| Title |
Observation of a nonlocal conductivity in the mixed state of YBa2Cu3O7-d: Experimental evidence for a vortex line liquid |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
| Volume |
72 |
Issue |
8 |
Pages |
1272 |
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| Abstract |
We report on transport measurements in the mixed state of YBa2Cu3O7 single crystals using the dc flux transformer geometry. In the vortex fluid regime we have observed the onset of a nonlocal conductivity. At lower temperatures, close to but above the phase transition temperature the vortices become effectively three dimensional in character. This is in sharp contrast to recent flux transformer experiments on Bi2Sr2CaCu2O which have failed to see a nonlocal conductivity, confirming the two-dimensional character at high temperatures of the vortices in that system. These observations suggest that in a finite temperature interval, the vortex state in YBa2Cu3O7 is a line liquid. |
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BT @ gnieva @ |
Serial |
443 |
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| Author |
López, D.; Nieva, G.; de la Cruz, F. |
| Title |
In- and out-of-plane vortex correlations in YBa2Cu3O7 |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
50 |
Issue |
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Pages |
7219 |
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BT @ gnieva @ |
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444 |
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| Author |
López, D.; Nieva, G.; de la Cruz, F.; Jensen, Henrik Jeldtoft; O’Kane, Dominic |
| Title |
Flux cutting in YBa2Cu3O7-δ single crystals: Experiment and phenomenological model |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
50 |
Issue |
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Pages |
9684 |
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We measured the current-induced loss of vortex correlation in YBa2Cu3O7-δ crystals using the pseudo-dc-flux-transformer geometry. We find that the current density Jcut at which the top and bottom voltage drops differ is a linear function of temperature, is independent of pinning, and depends on the thickness of the sample. This thickness dependence strongly suggests that the electrical current flows at the surface of the sample. The observed behavior with temperature, magnetic field, and thickness is described by a phenomenological model. |
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BT @ gnieva @ |
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445 |
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López, D.; Safar, H.; Gammel, P.L.; Huse, D.A.; Majumdar, S.N.; Schneemeyer, L.F.; Bishop, D.J.; Nieva, G.; de la Cruz, F. |
| Title |
Reply to the Comment: Local versus Non-Local Conductivity in YBa2Cu3O7-d |
Type |
Journal Article |
| Year |
1995 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
| Volume |
75 |
Issue |
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Pages |
2447 |
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| Abstract |
A Reply to the Comment by Yu. Eltsev and O. Rapp. |
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BT @ gnieva @ |
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446 |
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Lopez, D.; Righi, E. F.; Nieva, G.; de la Cruz, F.; Kwok, W. K.; Fendrich, J. A.; Crabtree, G. W.; Paulius, L. |
| Title |
Amplification of the c-axis vortex correlation by twin-boundary pinning at the vortex liquid-solid phase transition |
Type |
Journal Article |
| Year |
1996 |
Publication |
PHYSICAL REVIEW B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
53 |
Issue |
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Pages |
R8895 |
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Transport measurements using the dc flux transformer configuration together with c-axis resistance data in clean and twinned YBa2Cu3O7-δ single crystals show that vortices are localized by the twin-boundary potential. The results support the existence of a divergent tilt modulus [D. R. Nelson and V. M. Vinokur, Phys. Rev. B 48, 13 060 (1993)] in a liquid that freezes into a Bose glass |
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no |
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BT @ gnieva @ |
Serial |
447 |
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| Author |
López, D.; Righi, E. F.; Nieva, G.; de la Cruz, F. |
| Title |
Coincidence of Vortex-Lattice Melting and Loss of Vortex Correlation along the c Direction in Untwinned YBa2Cu3O7-δ Single Crystals |
Type |
Journal Article |
| Year |
1996 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
| Volume |
76 |
Issue |
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Pages |
4034 |
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We report on transport measurements using the dc flux transformer configuration in clean and twinned single crystals of YBa2Cu3O7-δ. We show that correlated disorder changes not only the order of the solid-liquid phase transition but also the nature of the vortices in the liquid state. In clean crystals, melting is shown to take place between a solid of vortex lines and a liquid with no correlation in the direction of the magnetic field. |
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BT @ gnieva @ |
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448 |
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Safar, H.; Lopez, D.; Gammel, P.L.; Huse, D.A.; Majumdar, S.N.; Schneemeyer, L.F.; Bishop, D.J.; Nieva, G.; de la Cruz, F. |
| Title |
Experimental evidence of a non-local resistivity in a vortex line liquid |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physica C: Superconductivity |
Abbreviated Journal |
Physica C |
| Volume |
235-240 |
Issue |
4 |
Pages |
2581-2582 |
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We present transport measurements on YBCO single crystals in the vortex liquid regime using the DC flux transformer geometry. We show that the data are inconsistent with the material being an anisotropic, local conductor. The results provided evidence for non-local transport which indicate that there can be correlated vortex motion over macroscopic distances in this system. We have shown that this correlated vortex motion can be destroyed by either thermal fluctuations or the applications of large driving forces. |
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BT @ gnieva @ |
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450 |
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