Magnetic flux turbulence was observed in single crystals of NdBa2Cu3O6+x near-optimally doped (x approximate to 1) and underdoped YBa2Cu3O6-x (x=0.50,0.82) using magneto-optical imaging. Such turbulent phenomena have so far been reported only for YBa2Cu3O6+x high-quality single crystals with optimal doping. The crystals were also characterized in terms of critical current density j(c), anisotropy gamma, and oxygen content/superstructure. The influence of these parameters on the turbulent behavior is discussed.
Frello, T., Baziljevich, M., Johansen, T. H., Andersen, N. H., Wolf, T., & Koblischka, M. R. (1999). Flux turbulence in NdBa2Cu3O6+x and underdoped YBa2Cu3O6+x single crystals. Physical Review B, 59(10), R6639-R6642. https://doi.org/10.1103/PhysRevB.59.R6639