Excitation of Josephson plasma and vortex oscillation modes inBi2Sr2

Abstract

The Josephson plasma resonance of Bi 2 Sr 2 CaCu 2 O 8ϩ␦ in parallel magnetic fields has been measured by angular alignment with ϳ0.02 degree precision to reveal the phase collective modes in the Josephson vortex lattice. When the angle between the field and the CuO 2 plane is tilted from the c axis, the resonance field scales as H sin in the range տ4°. At lower angles, the resonance field shows anomalous decreases with decreasing . A disappearance of the resonance has been unexpectedly found for angles within ϳ0.2°, which may correspond to the angle where the lock-in transition takes place. The origin of the phenomenon is discussed in terms of the Josephson plasma oscillation and Josephson vortex oscillation modes.

New Josephson Plasma Modes in UnderdopedYBa2Cu3O6.6Kojima1, Uchida2, Fudamoto3 et al. 2002Phys. Rev. Lett.323300View full textAdd to dashboardCite

“…In Bi-2212, there have been microwave resonance measurements under parallel applied magnetic fields [14,15,16], and resonance peaks have been observed in microwave absorption spectra. However, in the microwave study, it is not possible to discuss the origin of the observed modes quantitatively.…”

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

“…We now seek a uniform, in the z-direction, solution of Eq. (12). Normalizing the coordi-nate x to λ c and time t to 1/ω J , we can rewrite Eq.…”

“…As with other resonance methods, the Josephson plasma resonance is a sensitive and convenient tool for the study of the material properties [11][12][13][40][41][42][43][44][45][46]. Evidently, the JPR gives direct information about the Josephson coupling of the superconducting layers.…”

“…(12). We assume that the main phase difference is across the weak contact, where a JV is located, whereas ϕ l+1,l is small across other junctions.…”

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“…The Josephson plasma resonance (JPR) observed in the microwave absorption [1], and in optical reflection [2][3][4][5] and transmission measurements [6,7], has proven to be a powerful method to study the properties of highly anisotropic layered superconductors, such as vortex phases [1,8]. In particular, the spatial dispersion of the JPR, ω p (k, k z ), parallel (k) and perpendicular (k z ) of the superconducting layers reflects the inductive coupling of junctions due to intralayer currents and the charge coupling due to the variations of the electrochemical potential on the layers, respectively.…”