Amb motiu del tancament d'estiu, la validació de documents es reprendrà a partir del 28 d'agost de 2026. Disculpeu les molèsties.
Con motivo del cierre de verano, la validación de documentos se reanudará a partir del 28 de agosto de 2026. Disculpad las molestias
Due to the summer closure, document validation will resume starting August 28, 2026. We apologize for any inconvenience.

Fitxers

558154.pdf (301.39 KB)

Tipus de document

Article

Versió

Versió publicada

Data de publicació

2008

Tots els drets reservats

Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/10931

Topological magnetic irreversibility in superconducting Pb samples of various shapes

Títol de la revista

Autors

Director/Tutor

ISSN de la revista

Títol del volum

Recurs relacionat

http://dx.doi.org/10.1103/PhysRevB.78.134501

Resum

The magnetic-field dependence of the magnetization of cylinders, disks, and spheres of pure type-I superconducting lead was investigated by means of isothermal measurements of first magnetization curves and hysteresis cycles. Depending on the geometry of the sample and the direction and intensity of the applied magnetic field, the intermediate state exhibits different irreversible features that become particularly highlighted in minor hysteresis cycles. The irreversibility is noticeably observed in cylinders and disks only when the magnetic field is parallel to the axis of revolution and is very subtle in spheres. When the magnetic field decreases from the normal state, the irreversibility appears at a temperature-dependent value whose distance to the thermodynamic critical field depends on the sample geometry. The irreversible features in the disks are altered when they are submitted to an annealing process. These results agree well with very recent high-resolution magneto-optical experiments in similar materials that were interpreted in terms of transitions between different topological structures for the flux configuration in the intermediate state. A discussion of the relative role of geometrical barriers for flux entry and exit and pinning effects as responsible for the magnetic irreversibility is given.

Matèries

Superconductivitat, Mecànica estadística

Matèries (anglès)

Superconductivity, Statistical mechanics

Citació

Col·leccions

Articles publicats en revistes (Física de la Matèria Condensada)

Citació

VÉLEZ, Saül, et al. Topological magnetic irreversibility in superconducting Pb samples of various shapes. Physical Review B. 2008. Vol. 78, num. 13, pags. 134501-1-134501-5. ISSN 0163-1829. [consulted: 4 of August of 2026]. Available at: https://hdl.handle.net/2445/10931

Exportar metadades

JSON - METS

Compartir registre