Physics – Condensed Matter – Superconductivity
Scientific paper
2001-03-26
Phys. Rev. Lett. 86, 4660-4663 (2001)
Physics
Condensed Matter
Superconductivity
4 pages, ReVTeX, 5 eps figures, PRL, in press
Scientific paper
10.1103/PhysRevLett.86.4660
Infrared spectroscopy has been used to investigate the temperature dependence and c-axis magnetic field dependence of the Josephson plasma resonance in optimally doped Tl2Ba2CaCu2O8 thin films, and underdoped YBa2Cu3O6.5 ortho - II single crystals. The resonances are directly related to the c-axis penetration depths, yielding low temperature, zero fields values of about 20 micrometer, and 7 micrometer respectively. While the temperature dependencies of the resonances in the two compounds are very similar, the magnetic field dependence in YBCO is much weaker. We attribute this weak magnetic field dependence to the lower anisotropy of YBCO, and discuss the observed behaviours in terms of thermal fluctuations and pinning of pancake vortices, valid for highly anisotropic layered superconductors.
Bonn Douglas A.
der Marel Dirk van
Dulic Diana
Hak J.
Hardy Walter N.
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