Grzegorz Jung: Coherent vortex motion in superconductors

Experimental Superconductivity and Magnetism Group

Superconducting quantum phase coherence gives rise to a variety of macroscopic quantum phenomena, among them to the Josephson effects. Due to extremely short coherence length, voltages appearing across high-TC superconducting microbridges are not related to Josephson effects but to the motion of current-created vortices. Josephson-like effects may however appear in relatively large high-TC bridges due to the coherence in current driven vortex flow. To enforce the coherent regime we employ laser written channels of easy vortex motion in c-axis oriented YBCO thin films, and heavy ion irradiated channels in BSCCO single crystals. The project is supported by the Israeli Science Foundation grant.

Figure 1: Schematic of the layout of bridge with laser written channel for easy vortex motion.
Figure 2: Magneto-optical image of field penetration into a laser written channel in the bridge constriction. Bright areas mark high magnetic field.
Other active research projects, supported by four research grants, are opened for Ph.D. and M.S. students and include:
  • Dynamics of vortices in spatially restricted superconductors (Grzegorz Jung)
  • Anisotropy of flux-flow noise in vicinal YBCO thin films (Grzegorz Jung)
  • Intrinsic tunneling in colossal magnetoresistive materials (CMR) (Grzegorz Jung, Vladimir Markovich)
  • Metastable resistivity in CMR manganites (Grzegorz Jung, Gad Gorodetsky, Vladimir Markovich)
  • Local magnetic properties of CMR manganites. (Grzegorz Jung, Gad Gorodetsky, Vladimir Markovich).
  • Magnetic and transport noise in CMR manganites (Grzegorz Jung, Vladimir Markovich)
  • Current noise in quantum wells. (Grzegorz Jung)
  • Noise and plasmons enhanced charge separation in nanoparticles based devices. (Grzegorz Jung)
  • Ferromagnetic resonance and phase separation in bulk and nano-scale CMR materials (Evgeny Rosenberg, Alexander Shames, Gad Gorodetsky, Grzegorz Jung)
  • Transport, resonance and optical properties of carbon nanotubes filled with charge or magnetically ordered materials. (Evgeny Rosenberg, Grzegorz Jung)
Further details will be available soon at Prof. Jung's web site.