Electronic Resource
Springer
Journal of low temperature physics
117 (1999), S. 897-901
ISSN:
1573-7357
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Magnetic measurements have been performed on single crystals of TlBa 2 Ca 3 Cu 4 O 11+δ in the magnetic fields up to 5.5 T. No change in the onset temperature of superconducting transition (T c ) was observed in the magnetic fields between 0.4 and 5.5 T, while the superconducting transitions were broadened significantly in the same field. The linear temperature-dependence of the magnetization was found in a large temperature range below T c . The slope of the magnetization versus temperature $$(\frac{{d(4\pi M)}}{{dT}})$$ decreased significantly with increasing magnetic field. The experimental findings indicated that the upper critical field (H C2 ) in this compound was very large and traditional methods of deriving H C2 value were not applicable. Using the measured magnetization in the reversible region, the H C2 properties of TlBa 2 Ca 3 Cu 4 O 11+δ single crystals have been studied based on a new model developed by Hao et al.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1022550824051
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