Evidence for LineLike Vortex Liquid Phase in Tl${}_2$Ba${}_2$CaCu${}_2$O${}_8$ Probed by the Josephson Plasma Resonance

Abstract

We measured the Josephson plasma resonance (JPR) in optimally doped Tl${}_2$Ba${}_2$CaCu${}_2$O${}_{8+\delta }$ thin films using terahertz time-domain spectroscopy in transmission. The temperature and magnetic field dependence of the JPR frequency shows that the c-axis correlations of pancake vortices remain intact at the transition from the vortex solid to the liquid phase. In this respect Tl${}_2$Ba${}_2$CaCu${}_2$O${}_{8+\delta }$ films, withanisotropy parameter $\gamma \approx 150$, are similar to the less anisotropic YBa${}_2$Cu${}_3$O${}_{7-\delta }$ $(\gamma \approx 8)$ rather than to the most anisotropic Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ single crystals $\gamma \ge 500$).

Submitted to Physical Review Letters

References in corpus (2)

• C-axis Josephson Plasma Resonance Observed in Tl${}_2$Ba${}_2$CaCu${}_2$O${}_8$ Superconducting Thin Films using Terahertz Time-Domain Spectroscopy
• Effects of Vortex Pinning and Thermal Fluctuations on the Josephson Plasma Resonance in Tl2Ba2CaCu2O8 and YBa2Cu3O6.5

Cited by in corpus (3)

• Ultrafast Conductivity Dynamics in Pentacene Probed using Terahertz Spectroscopy
• Electrodynamics of Josephson vortex lattice in high-temperature superconductors
• In-plane field-induced vortex liquid correlations in underdoped Bi_2Sr_2CaCu_2O_8+δ