Enhanced Macroscopic Quantum Tunneling in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ Intrinsic Josephson Junction Stacks

Details Enhanced Macroscopic Quantum Tunneling in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ Intrinsic Josephson Junction Stacks Enhanced Macroscopic Quantum Tunneling in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ Intrinsic Josephson Junction Stacks

2006-03-16

arxiv.org/abs/cond-mat/0603445v1

PRL 96, 177003 (2006)

Physics

Condensed Matter

Superconductivity

4 pages and 5 figures

Scientific paper

10.1103/PhysRevLett.96.177003

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 N junctions is about $N^2$ times higher than that of a single junction having the same plasma frequency. We argue that this gigantic enhancement of 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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