Anomalous behaviour of the vortex structure in Bi4Ca2Sr4Cu4O16+y measured with a vibrating reed at low magnetic fields

Rodríguez, E.; Durán, C.; Luzuriaga, J.; Cruz, F. de la; Fainstein, C.

doi:10.1016/0921-4534(90)90210-6

Cited by 19 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rodriguez et a1 [2] (and references therein) mentioned that at a temperature where the change in the flux line lattice could be observed by the vibrating reed method, no evidence for reversible magnetization was found with a SQUID magnetometer. This means that at 0953-2M8/92/01MXn + 09 504.50 @ 1992 IOP Publishing Ltd "a..n""".., t , .…”

Section: Introductionmentioning

confidence: 99%

Study of the vortex state of Bi-2223 by magnetic analysis

Job¹,

Rosenberg²

1992

Supercond. Sci. Technol.

View full text Add to dashboard Cite

From detailed magnetization studies in fields up to 2 T in t h e temperature range between 4 and 90 K an empirical magnetic phase diagram for 81-2223 HTSC has been derived. The 'depinning Iine'E*(T) h a s been estimated where the critical current density J, becomes zero in fields well below Hc2. In t h e region with non-zero critical current densities we mainly found evidence for collective pinning behaviour. Only at fields smaller than about 1.5 T and at lower temperatures might single vortex pinning occur. The enhancement of the first critical field ,H,, in the low temperature range might originate from surface effects, as can be qualitatively explained. The temperature dependence of the critical current density J, gives evidence for t h e existence of two hinds of pinning centre. A large number of pinning centres with low activation energy, therefore being active mainly at lower temperatures, might be responsible for the enhancement ofJ, below 30 K.

show abstract

Section: Introductionmentioning

confidence: 99%