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

@article{Kubo2012MacroscopicQT,
  title={Macroscopic quantum tunneling and phase diffusion in a La\$\_\{2-x\}\$Sr\$\_x\$CuO\$\_4\$ intrinsic Josephson junction stack},
  author={Y Kubo and A. O. Sboychakov and Franco Nori and Yamaguchi Takahide and Shigenori Ueda and Isao Tanaka and Atm Nazmul Islam and Yoshihiko Takano},
  journal={Physical Review B},
  year={2012},
  volume={86}
}
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… 
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