Flux pinning and magnetic relaxation in melt-processed YBa2Cu3O7−δ doped with Li

Autor:	L. Shlyk, G. Fuchs, Konstantin Nenkov, B. Schüpp, G. Krabbes
Rok vydání:	2004
Předmět:	Superconductivity Flux pinning Materials science Condensed matter physics Magnetic moment Condensed Matter::Superconductivity General Physics and Astronomy Magnetic hysteresis Magnetic susceptibility Pinning force Critical field Magnetic field
Zdroj:	Journal of Applied Physics. 96:3371-3378
ISSN:	1089-7550 0021-8979
Popis:	Melt-processed samples of YBa2Cu3O7−δ (YBCO) doped with Li additions substituting at Cu(2) plane sites were used to study the effects of doping on the superconducting temperature, critical current density, irreversibility field, upper critical field, coherence length, and magnetic relaxation as a function of temperature and magnetic field. The intrinsic superconducting properties were found only slightly influenced by Li additions at some optimal concentration (0.6at.%). At this Li concentration the volume pinning force of doped material is about five times that of undoped YBCO in intermediate magnetic fields at 77K. No significant change of the maximum volume pinning force with oxygen defects after long-time oxygenation experiment (∼450h) has been observed. The normalized pinning force of the sample optimally doped with Li obeys the same scaling law as a function of magnetic field and temperature before and after additional heat treatment, indicative of a single type of pinning centers. The time dependen...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::271f34f0bcfd010f5dd04080d23c2210 https://doi.org/10.1063/1.1778215 Zobrazit plný text záznamu