Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 3: Correlated Electrons: Heavy Fermions
TT 3.2: Talk
Monday, March 26, 2012, 09:45–10:00, H 3005
Superconducting gap symmetry from the quasiparticle interference in the heavy fermion superconductor CeCoIn5 — •Alireza Akbari1, Peter Thalmeier1, and Ilya Eremin2 — 1Max Planck Institute for the Chemical Physics of Solids, 01187 Dresden, Germany — 2Theoretische Physik III, Ruhr-Universität Bochum, 44780, Bochum, Germany
One of the most difficult issues in the heavy Fermion superconductors like the 115 compounds CeMIn5 (M = Co, Ir, Rh)
is the identification of the symmetry of superconducting order parameter.
The ambiguity between dxy and dx2−y2 symmetry remained from earlier specific heat and thermal transport
investigations has been resolved in favor of the latter by the observation of a spin resonance that can occur only in dx2−y2 symmetry. However these
methods are all indirect and depend considerably on theoretical interpretation.
We presented the theory for
the quasiparticle interference (QPI) in the heavy Fermion superconductor CeCoIn5 as a direct method
to confirm the d-wave gap symmetry.
We calculate the QPI pattern for both magnetic and nonmagnetic impurities.
By comparing the effect of the
possible d-wave superconducting order parameters on QPI, the characteristic differences are found which may be identified by STM method.
Our results propose that quasiparticle interference (QPI) and scanning
tunneling microscopy (STM) can give a direct fingerprint of the superconducting gap in real space which may lead to a definite conclusion on its symmetry
for CeCoIn5 and related 115 compounds.
A. Akbari, P. Thalmeier, I. Eremin, Phys. Rev. B 84, 134505 (2011).