Josephson Plasma Resonance in Solid and Glass Phases of Bi 2 Sr 2 Cacu 2 O 8+δ
نویسندگان
چکیده
Vortex matter phases and phase transitions are investigated by means of Josephson plasma resonance in underdoped Bi2Sr2CaCu2O8+δ single crystals in a microwave frequency range between 19 and 70 GHz. Accompanied by the vortex lattice melting transition, a jump of the interlayer phase coherence extracted from the field dependence of the plasma frequency was observed. In the solid phase, the interlayer coherence little depends on field at a temperature region well below Tc while it gradually decreases as field increases toward the melting line up to just below Tc. As a result, the magnitude of the jump decreases with increasing temperature and is gradually lost in the vicinity of Tc. This indicates that the vortex lines formed in the vortex solid phase are thermally meandering and the phase transition becomes weak especially just below Tc.
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