Magnetization relaxation in YBCO films with improved supercurrent transport properties
Journal of physics : conference series. Bd. 243. 2010 S. 12026-1 - 12026-9
Erscheinungsjahr: 2010
Publikationstyp: Zeitschriftenaufsatz (Forschungsbericht)
Sprache: Englisch
Doi/URN: 10.1088/1742-6596/234/1/012026
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Inhaltszusammenfassung
The relaxation of the irreversible magnetization in optimally doped YBCO films with natural and artificial pinning centres was measured in zero-field cooling conditions using SQUID magnetometry. The external magnetic field H was oriented along the c axis. An appropriate method for the determination of the characteristic vortex pinning energy from the normalized vortex-creep activation energy is discussed. This is based on the existence of a crossover elastic (collective) vortex creep at low t...The relaxation of the irreversible magnetization in optimally doped YBCO films with natural and artificial pinning centres was measured in zero-field cooling conditions using SQUID magnetometry. The external magnetic field H was oriented along the c axis. An appropriate method for the determination of the characteristic vortex pinning energy from the normalized vortex-creep activation energy is discussed. This is based on the existence of a crossover elastic (collective) vortex creep at low temperatures T ? plastic vortex creep at high T, caused by the T dependent macroscopic currents induced in the sample during magnetization measurements. » weiterlesen» einklappen
Autoren
Klassifikation
DFG Fachgebiet:
Physik der kondensierten Materie
DDC Sachgruppe:
Physik
