INVESTIGADORES
SLOBINSKY Demian Gustavo
congresos y reuniones científicas
Título:
Anisotropic mass renormalization in Sr2RuO4
Autor/es:
E. J. ROZBICKI; A. TAMAI; P.D.C. KING; W. MEEVASANA; A. S. GIBBS; A. P. MACKENZIE; D. SLOBINSKY; F. BAUMBERGER
Lugar:
Dallas
Reunión:
Conferencia; American Physical Society March Meeting; 2011
Institución organizadora:
American Physical Society
Resumen:
The layered perovskite Sr$_{2}$RuO$_{4}$ continues to attract
interest as a model system of a multiband Fermi liquid. Previous
dHvA and ARPES studies successfully determined its Fermi surface
[1, 2] and reported a large and sheet dependent renormalization
of the Fermi velocity due to electron-electron interactions with
v$_{band}$/v$_{F}$ ranging from $\approx$ 3 for the d$_{xz/yz}$
derived $\alpha$ and $\beta$ sheets to $\approx$ 5.5 for the
$\gamma$ sheet with dominant dxy orbital character [1, 3]. Here,
we report new high-resolution ARPES data revealing an additional
strong momentum dependence of the renormalization within a single
Fermi surface sheet. This effect is most pronounced in the
$\gamma$ band and is larger than expected from the mixing of the
orbital composition along individual Fermi surface sheets induced
by spin-orbit coupling [4,5]. Our observations therefore provide
evidence for a genuinely momentum dependent self-energy in the
vicinity of a van Hove singularity.
[1] C. Bergemann et al., Advances in Physics 52, 639 (2003)[2] A. Damascelli et al., Physical Review Letters 85,
5194 (2000). [3] K.M. Shen et al., Physical Review Letters 99, 187001
(2007). [4] M.W. Haverkort et al., Phys Rev Lett. 101, 026406 (2008) [5] J. Mravlje et al., arXiv:1010.5910v1(2010)