### Abstract

In the vortex liquid state the Josephson plasma frequency ω_{p} is strongly affected by fluctuations in the vortex pancakes. We have measured in detail the variation of ω_{p} with field B and tilt angle θ in Bi_{2}Sr_{2}CaCu_{2}O_{8}. We compare the data with Koshelev's expression relating ωp to the correlation function of the local phase S_{1}. The agreement is quite close for θ > 1°, provided f varies with B with a weak exponent (f measures the number of pancakes within a correlated area). A scattering picture is introduced to clarify how the plasma resonance is equivalent to a Fourier transform of |S_{1}|^{2} . From the fit, we find that, at 50 K and 1 T, f ≈ 1.4 pancakes, J_{c0} equals 4160 A/cm^{2} and 〈cos φ_{n,n+1}〉 = 0.028. Deviations observed when B is aligned with the planes are discussed.

Original language | English (US) |
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Pages (from-to) | 20-24 |

Number of pages | 5 |

Journal | Physica C: Superconductivity and its applications |

Volume | 293 |

Issue number | 1-4 |

DOIs | |

State | Published - Dec 1997 |

### All Science Journal Classification (ASJC) codes

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering

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## Cite this

*Physica C: Superconductivity and its applications*,

*293*(1-4), 20-24. https://doi.org/10.1016/S0921-4534(97)01501-3