Low-temperature magnetic relaxation in YBa2Cu3O7- delta : Evidence for quantum tunneling of vortices.

@article{Fruchter1991LowtemperatureMR,
  title={Low-temperature magnetic relaxation in YBa2Cu3O7- delta : Evidence for quantum tunneling of vortices.},
  author={Fruchter and Malozemoff and C S Campbell and S{\'a}nchez and Konczykowski and Griessen and Holtzberg},
  journal={Physical review. B, Condensed matter},
  year={1991},
  volume={43 10},
  pages={8709-8712}
}