Collective Josephson Plasma Resonance in the Vortex State of Bi 2 Sr 2 Ca <mml:mi …
1995; American Physical Society; Volume: 75; Issue: 24 Linguagem: Inglês
10.1103/physrevlett.75.4512
ISSN1092-0145
AutoresYuji Matsuda, M. B. Gaifullin, K. Kumagai, K. Kadowaki, T. Mochiku,
Tópico(s)Magnetic confinement fusion research
ResumoWe have measured the microwave surface resistance (30-60 GHz) for different crystallographic orientations in the vortex state of ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}\mathrm{Ca}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$. A sharp magnetoabsorption resonance is observed below ${T}_{c}$ when ac electric fields and magnetic fields are applied parallel to the $c$ axis (${E}_{\mathrm{ac}}\ensuremath{\parallel}B\ensuremath{\parallel}c$). We argue that the observed resonance arises from collective Josephson plasma oscillations generated by interlayer Josephson currents. From the frequency and temperature dependence of the resonance, we discuss the interlayer phase coherence in the vortex liquid and solid states quantitatively.
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