Enhanced Macroscopic Quantum Tunneling inBi2Sr2CaCu2O8+δIntrinsic Josephson-Junction Stacks

2006/03/16 by Xueying Jin, X. Y. Jin, Jürgen Lisenfeld +6 · 6 citations
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.96.177003

published as PRL 96, 177003 (2006) · 4 pages and 5 figures

arxiv created 2006/03/16 · openalex publication_date 2006/05/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We have investigated macroscopic quantum tunneling in Bi(2)Sr(2)CaCu(2)O(8 + delta) intrinsic Josephson junctions at millikelvin temperatures using microwave irradiation. Measurements show that the escape rate for uniformly switching stacks of Nu junctions is about Nu(2) times higher than that of a single junction having the same plasma frequency. We argue that this gigantic enhancement of the macroscopic quantum tunneling rate in stacks is boosted by current fluctuations which occur in the series array of junctions loaded by the impedance of the environment.

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