Macroscopic quantum tunneling and phase diffusion in a La$_{2-x}$Sr$_x$CuO$_4$ intrinsic Josephson junction stack

Details Macroscopic quantum tunneling and phase diffusion in a La$_{2-x}$Sr$_x$CuO$_4$ intrinsic Josephson junction stack Macroscopic quantum tunneling and phase diffusion in a La$_{2-x}$Sr$_x$CuO$_4$ intrinsic Josephson junction stack

2011-12-30

arxiv.org/abs/1201.0104v1

Physics

Condensed Matter

Superconductivity

9 pages, 6 figures

Scientific paper

We performed measurements of switching current distribution in a submicron La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) intrinsic Josephson junction (IJJ) stack in a wide temperature range. The escape rate saturates below approximately 2\,K, indicating that the escape event is dominated by a macroscopic quantum tunneling (MQT) process with a crossover temperature $T^{*}\approx2\,$K. We applied the theory of MQT for IJJ stacks, taking into account dissipation and the phase re-trapping effect in the LSCO IJJ stack. The theory is in good agreement with the experiment both in the MQT and in the thermal activation regimes; thus it is confirmed that the enhancement of MQT rate due to interaction between junctions in the stack is a universal phenomenon in IJJs.

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