Issue |
Europhys. Lett.
Volume 33, Number 9, March III 1996
|
|
---|---|---|
Page(s) | 701 - 706 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1996-00402-x | |
Published online | 01 September 2002 |
Low-field dc magnetization investigations in a Bi2Sr2CaCu2O8 single crystal: observation of a magnetic phase transition at the vortex melting line
Département de Physique de la Matière Condensée, Université
de Genève, 24 quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland
Received:
1
November
1995
Accepted:
26
January
1996
The mixed-state magnetization of a Bi-2212 single crystal has
been investigated with high resolution using a SQUID magnetometer. In the
high-temperature region
K), we found that the slope
vs. H shows a positive step at
with
Oe and n=1.28.
This observation is compatible with a first-order phase transition with a
distribution of internal fields, and is attributed to the melting of the 3D
vortex lattice. The estimated entropy jump is 1 kB/vortex/layer CuO.
However, when T is lower than 50 K, we observe radical changes in M(H);
the 3D melting line divides into a decoupling line at a temperature-independent
field and the onset of the irreversibility.
PACS: 74.60.Ec – Mixed state, critical fields, and surface sheath
© EDP Sciences, 1996
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.