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Superconductor Science and Technology

Microwave oscillation from Bi2Sr2CaCu2Oyintrinsic Josephson junction arrays

Kiejin Lee, Sunmi Kim, Ienari Iguchi, Takayuki Ishibashi, Katsuaki Sato

Published Nov 21, 2001• 0 citations
Publisher

Abstract

We report the novel nonequilibrium microwave emission from current-injected Bi 2 Sr 2 CaCu 2 O y (BSCCO)/I/Au intrinsic Josephson junctions and two-mesa array of intrinsic Josephson junctions. For the single intrinsic junctions, it appeared as three different modes of oscillations. Among them, two modes are Josephson plasma emissions which appeared at the quasiparticle branches and the gap-edges. The mutual phase interaction between two-mesa structures of BSCCO intrinsic Josephson junctions has been studied. The measured output power of the two-mesa structures of intrinsic Josephson junctions was almost four times larger than that of the single junction, indicating an exact phase-locking state between the two intrinsic Josephson junctions. The maximum detected power was about microwatt level at millimetre-wave range.

DOI
10.1088/0953-2048/14/12/313

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We report on high frequency experiments with mesa structures patterned on Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+y/ single crystals (BSCCO). Due to the intrinsic Josephson effect between adjacent CuO/sub 2/ bilayers these mesas form stacks of 100 to 500 Josephson junctions. The ac-Josephson effect was investigated in the frequency range between 6 GHz and 120 GHz. We focus our interest on possible applications of intrinsic Josephson junctions as flux-flow oscillators and high-frequency mixers. These components form the essential parts of an integrated mm-wave receiver in BSCCO technology.
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We present a study of phase escape in surface Bi 2 Sr 2 CaCu 2 O 8+ δ intrinsic Josephson junctions in the presence of microwave radiation. The measured switching current distributions display clear double-peak structures in the microwave field, which result from the single- and two-photon resonant escape processes accompanied by microwave-induced potential barrier suppression. We show that these results can be well explained by a quantum-mechanical model proposed by Fistul et al (2003 Phys. Rev. B 68 060504), from which the power and frequency dependences of the switching current distributions can be reproduced.
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