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Giant Radiation Linewidth of Multifluxon States in Long Josephson Junctions

A. V. Ustinov, H. Kohlstedt, P. Henne

DOI 10.1103/PhysRevLett.77.3617 · Physical Review Letters

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Abstract

Millimeter-wave band radiation measurements of flux-flow states in long Josephson junctions are reported. At low fluxon density, the radiation linewidth is found by factor of 104 larger than that of a lumped Josephson oscillator. With increasing the fluxon density, a sharp crossover is observed to a much smaller linewidth approaching the lumped oscillator limit. Numerical simulations using perturbed sine-Gordon model show that the observed behavior is related to internal degrees of freedom in the moving fluxon chain.

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FormulaReported Tc (K)Pressure (GPa)Type
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9.2Pressure not reportedunknown

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