Abstract
Using two methods, the bolometric method and the cavity perturbation technique, we have observed the Josephson plasma resonance (JPR) in heavily underdoped Bi 2Sr 2CaCu 2O 8+ δ crystals ( T c=69.4 K) in the Bragg-glass phase in different magnetic fields. From these data, we obtain the penetration depth along the c-axis, λ c (0)=229±10 μm. The JPR results yielded an experimental estimate of the wandering length r w of vortex pancakes in the samples ( r w≈300–550 nm at 52 K depending on the magnetic field applied). We observe an increase of r w with increasing applied dc magnetic field applied.
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