Frequency dependence of the intergranular AC loss peak in a high-T-c Bi-(Pb)-Sr-Ca-Cu-O bulk superconductor
Küçük Resim Yok
Tarih
1998
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
ELSEVIER SCIENCE BV
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
We have performed AC susceptibility measurements as a function of temperature; frequency and AC field amplitude on a rectangular bar shaped high-temperature superconductor with nominal composition of Bi1.8.4Pb0.34Sr1.91Ca2.03Cu3.06O10 prepared by the liquid ammonium nitrate method. We have observed that as the frequency (AC field amplitude) increases, the intra- and intergranular AC loss peaks move higher (lower) temperature, which indicates that AC losses are due to both hysteretic bulk pinning losses and viscous (flux flow) losses. M-H curves exhibit a hysteresis which is similar to that of hysteretic superconductors. Activation energy at the grain boundary is extracted from the loss peak at some selected AC fields. Experimental results are qualitatively discussed in the framework of the critical state model (CSM). (C) 1998 Elsevier Science B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
AC susceptibility, AC losses, high-T-c Bi-(Pb)-Sr-Ca-Cu-O superconductors, activation energy
Kaynak
PHYSICA C
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
309
Sayı
45323
