Effects of Vortex Pinning and Thermal Fluctuations on the Josephson Plasma Resonance in Tl2Ba2CaCu2O8 and YBa2Cu3O6.5

Diana Dulić; S. J. Hak; D. van der Marel; W. N. Hardy; A. E. Koshelev; Ruixing Liang; D. A. Bonn; B. A. Willemsen

doi:10.1103/PhysRevLett.86.4660

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Effects of Vortex Pinning and Thermal Fluctuations on the Josephson Plasma Resonance in Tl2Ba2CaCu2O8 and YBa2Cu3O6.5

Diana Dulić, S. J. Hak, D. van der Marel, W. N. Hardy, A. E. Koshelev, Ruixing Liang, D. A. Bonn, B. A. Willemsen

DOI 10.1103/PhysRevLett.86.4660 · Physical Review Letters

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Abstract

We investigated the temperature dependence and c-axis magnetic field dependence of the Josephson plasma resonance in optimally doped Tl2Ba2CaCu2O8 thin films and underdoped YBa2Cu3O6.5 (YBCO) ortho-II single crystals using infrared spectroscopy. We obtained the c-axis penetration depths, at low temperature, in zero fields of about 20 and 7μm, 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 interpret the observed behaviors in terms of thermal fluctuations and pinning of pancake vortices.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	98	Pressure not reported	unknown
YBa2Cu3O6.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	58	Pressure not reported	unknown