Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Study of the relationship between the V-I 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 PHYSICS-CONDENSED MATTER
fascicolo: 11, volume: 13, anno: 2001,
pagine: 2583 - 2592
SICI:
0953-8984(20010319)13:11<2583:SOTRBT>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-TEMPERATURE SUPERCONDUCTORS; ELECTRIC-FIELD; MAGNETIC-FIELD; CREEP; RELAXATION; YBA2CU3O7-DELTA; 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 V-I curve and the flux dynamics in superconductors", J PHYS-COND, 13(11), 2001, pp. 2583-2592

Abstract

The equivalence of the experimental V-I characteristic (V proportional to I-m) and the material E-j curve (E proportional to j(n)) was studied. We show numerically that only when the current I is larger than I-hom, the fullypenetrating current, can the V-I curve be equivalent to the E-j one and thus be used to determine the material parameter n, whereas if I < I-hom, j is inhomogeneous and the V-I 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 I-hom varies with dI/dt and n. The dependence of I-hom on dI/dt indicates that current cannot go directly into a homogeneous region in practical transport measurements. Moreover, we argue that ail of the V-I curves with different values of the flux-creep barrier exponent <mu> merge at large current. Since current is probably inhomogeneous in the small-current region, the V-I curve might not be appropriate for use in studying the properties of the sample in this region. Therefore, the V-I curve may not be appropriate for determining mu in the U-j relation at all sensitively.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 06:08:01