The conductivity and the magnetization around T c in optimally-doped YBa2Cu3O7-δ revisited: quantitative analysis in terms of fluctuating superconducting pairs
| Autor: | J. M. Doval, Manuel V. Ramallo, Jesús Mosqueira, A. Ramos-Álvarez, Félix Vidal, Carlos Carballeira, R. I. Rey, J. C. Verde, J.A. Veira, D. Sóñora |
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| Rok vydání: | 2019 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Condensed Matter - Superconductivity Transition temperature Doping Metals and Alloys Thermal fluctuations Conductivity Condensed Matter Physics Magnetization Electrical resistivity and conductivity Condensed Matter::Superconductivity Materials Chemistry Ceramics and Composites Cuprate Electrical and Electronic Engineering |
| Zdroj: | Superconductor Science and Technology. 32:045009 |
| ISSN: | 1361-6668 0953-2048 |
| DOI: | 10.1088/1361-6668/aafe93 |
| Popis: | We first present detailed measurements of the rounding behavior around the superconducting transition temperature, $T_c$, of the in-plane electrical conductivity, magnetoconductivity and magnetization, including the low and moderate magnetic field regimes, in a high-quality single crystal and a thin film of the prototypical optimally-doped YBa$_2$Cu$_3$O$_{7-\delta}$ (OPT Y-123), in which the inhomogeneity effects are minimized. Then, it is presented a comparison of these experimental data with the phenomenological Ginzburg-Landau (GL) approach that takes into account the unavoidable contribution of the fluctuating pairs, the only theoretical scenario allowing at present to analyze these roundings at the quantitative level. These analyses demonstrate that the measured rounding effects around $T_c$ may be explained quantitative and consistently in terms of the GL scenario, even up to the rounding onset temperatures if the quantum localization, associated with the shrinkage of the superconducting wavefunction, is taken into account. The implications of our results on the pseudogap physics of optimally-doped cuprates are also discussed. Comment: Version of the preprint of the paper published in Superconductor Science & Technology 32, (2019) 045009, with an extended introduction and more references |
| Databáze: | OpenAIRE |
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