Anisotropic Rescaling of a Splayed Pinning Landscape in Hg Cuprates: Strong Vortex Pinning and Recovery of Variable Range Hopping
Abstract
Strong vortex pinning by fission-induced uniformly splayed columnar tracks in anisotropic mercury cuprates is demonstrated to result from (re)scaling of the pinning landscape by a large superconducting anisotropy. The effective ``narrowing'' of the splay distribution restores variable range vortex hopping (VRH) motion expected for nearly parallel pins. VRH emerges as a distinctive peak in the vortex creep rate ( ~12% at low fields at T/Tc~0.5) of the most anisotropic HgBa2Ca2Cu3O 8+δ, a peak well described by a glassy dynamics with the characteristic exponent μ~1/3.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 1998
- DOI:
- 10.1103/PhysRevLett.81.3948
- Bibcode:
- 1998PhRvL..81.3948K