| Issue |
Europhys. Lett.
Volume 44, Number 6, December II 1998
|
|
|---|---|---|
| Page(s) | 772 - 777 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00540-7 | |
| Published online | 01 September 2002 | |
Electronic vortex structure and flux-flow resistance steps in the cuprate superconductor 
Physikalisches Institut, Lehrstuhl Experimentalphysik II, Universität Tübingen, Morgenstelle 14 - D-72076 Tübingen, Germany
Received:
2
September
1998
Accepted:
17
October
1998
For the superconducting mixed state in the clean limit the electronic
density of states 
above and below the Fermi energy
is given by the bound states in the vortex core,
with the minigap 
as a prominent feature.
Quasiclassically, shows a steep increase near the
energy gap Δ. Since provides the phase space
for quasiparticle scattering, these features are expected to strongly
affect the flux-flow resistance. Our recent observation of two
intrinsic flux-flow resistance steps in epitaxial films of 
are explained in terms of these
features of near 
and
, respectively. The instabilities resulting for
current-bias from an electric-field–dependent resistance are
discussed in general terms.
PACS: 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.72.Jt – Other cuprates
© EDP Sciences, 1998
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