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Titolo: Study of the relationship between the VI curve and the flux dynamics in superconductors
Autore: Zhang, YH; Wang, ZH; Luo, H; Wu, XF; Luo, HM; Xu, Z; Ding, SY;
 Indirizzi:
 Nanjing Univ, Natl Lab Solid State Microstruct, Dept Phys, Nanjing 210093,Peoples R China Nanjing Univ Nanjing Peoples R China 210093 njing 210093,Peoples R China Tongji Univ, Dept Mat Sci & Engn, Shanghai 200092, Peoples R China Tongji Univ Shanghai Peoples R China 200092 ghai 200092, Peoples R China
 Titolo Testata:
 JOURNAL OF PHYSICSCONDENSED MATTER
fascicolo: 11,
volume: 13,
anno: 2001,
pagine: 2583  2592
 SICI:
 09538984(20010319)13:11<2583:SOTRBT>2.0.ZU;27
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 HIGHTEMPERATURE SUPERCONDUCTORS; ELECTRICFIELD; MAGNETICFIELD; CREEP; RELAXATION; YBA2CU3O7DELTA; FILMS;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Physical, Chemical & Earth Sciences
 discip_EC
 Citazioni:
 19
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Zhang, YH Nanjing Univ, Natl Lab Solid State Microstruct, Dept Phys, Nanjing 210093,Peoples R China Nanjing Univ Nanjing Peoples R China 210093 93,Peoples R China



 Citazione:
 Y.H. Zhang et al., "Study of the relationship between the VI curve and the flux dynamics in superconductors", J PHYSCOND, 13(11), 2001, pp. 25832592
Abstract
The equivalence of the experimental VI characteristic (V proportional to Im) and the material Ej curve (E proportional to j(n)) was studied. We show numerically that only when the current I is larger than Ihom, the fullypenetrating current, can the VI curve be equivalent to the Ej one and thus be used to determine the material parameter n, whereas if I < Ihom, j is inhomogeneous and the VI curve is not appropriate for use in probing theproperties of the sample. The inhomogeneity of j can be checked by simply measuring the voltage relaxation curve at a given I. Furthermore, it is shown that Ihom varies with dI/dt and n. The dependence of Ihom on dI/dt indicates that current cannot go directly into a homogeneous region in practical transport measurements. Moreover, we argue that ail of the VI curves with different values of the fluxcreep barrier exponent <mu> merge at large current. Since current is probably inhomogeneous in the smallcurrent region, the VI curve might not be appropriate for use in studying the properties of the sample in this region. Therefore, the VI curve may not be appropriate for determining mu in the Uj relation at all sensitively.
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Documento generato il 27/09/20 alle ore 06:08:01