We examine the macroscopic quantum tunneling (MQT) in high-Tc superconductor Josephson junctions with a d-wave order parameter. Using microscopic Hamiltonian and the functional integral method, we analytically obtain the MQT rate (the inverse lifetime of the metastable state) for the c-axis twist Josephson junctions. In the case of the zero twist angle, the system shows the super-Ohmic dissipation due to the presence of the nodal quasiparticle tunneling. Therefore, the MQT rate is strongly suppressed in compared with the finite twist angle cases.
@article{arxiv.cond-mat/0405628,
title = {Macroscopic Quantum Tunneling and Quasiparticle Dissipation in d-wave Superconductor Josephson Junctions},
author = {Shiro Kawabata and Satoshi Kashiwaya and Yasuhiro Asano and Yukio Tanaka},
journal= {arXiv preprint arXiv:cond-mat/0405628},
year = {2009}
}
Comments
4 pages, 1 figure, to appear in Phys. Rev. B 70 (2004) No.9