Phys. Rev. Lett. 76, 819–822 (1996)Excitation of the Josephson Plasma Mode in Bi2Sr2CaCu2O8+δ in an Oblique FieldReceived 17 July 1995; published in the issue dated 29 January 1996 We present evidence identifying the resonance in microwave absorption observed in Bi2Sr2CaCu2O8+δ in a field H as the Josephson plasma mode. The resonance field displays an unusual reentrant cusp when H is very close to alignment with the layers. By fitting to a model of Bulaevskii et al., we obtain an anisotropy parameter γ = 400–420 at 5 K, and a Josephson plasma frequency ωJ equal to 5.3 cm–1 (at H = 0). We also describe the dependence of ωJ on H and T when the applied field H∥c. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.819
DOI:
10.1103/PhysRevLett.76.819
PACS:
74.50.+r, 72.30.+q, 74.60.Ge, 74.72.Hs
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