Europhys. Lett.
Volume 46, Number 1, April I 1999
Page(s) 68 - 74
Section Condensed matter: electronic structure, electrical, magnetic and optical properties
Published online 01 December 2003
DOI: 10.1209/epl/i1999-00564-y

Europhys. Lett, 46 (1), pp. 68-74 (1999)

The Josephson plasma resonance in $\rm Bi_2Sr_2CaCu_2O_8$ in a tilted field

S. P. Bayrakci 1, Ophelia K. C. Tsui 1, N. P. Ong 1, K. Kishio 2 and S. Watauchi 2

1 Joseph Henry Laboratories of Physics, Princeton University Princeton, New Jersey 08544, USA
2 Department of Applied Chemistry, University of Tokyo Hongo, Bunkyo-ku, Tokyo 113, Japan

(received 9 November 1998; accepted in final form 22 January 1999)

PACS. 74.72Hs - High-$T_{\rm c}$ compounds: Bi-based cuprates.
PACS. 74.50+r - Proximity effects, weak links, tunneling phenomena, and Josephson effect.
PACS. 74.60Ge - Flux pinning, flux creep, and flux-line lattice dynamics.


The dependence of the Josephson plasma frequency $\omega_{\rm p}$ in $\rm Bi_2Sr_2CaCu_2O_8$ on a tilted field $\bf H$ is reported. Measurements over a large range of B and tilt angle $\theta$ allow a detailed comparison with a recent calculation by Koshelev. With a slight modification of the model, close agreement is obtained. From the fits, we find values for the in-plane correlation length and the zero-field critical current density $J_{\rm c0}$ (4600 A/cm2 at 30 K). An analogy to Bragg diffraction is described, as well as a picture for the fractional-exponent behavior of $\omega_{\rm p}$ vs. $\bf H$.


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