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Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: CE: Spin Systems and Itinerant Magnets

TT 22.5: Vortrag

Mittwoch, 24. März 2010, 10:30–10:45, H21

Accurate spin susceptibilities for strongly correlated metals — •Lewin Boehnke1, Olivier Parcollet2, Michel Ferrero3, and Frank Lechermann111. ITP, Universität Hamburg, D-20355 Hamburg, Germany — 2IPhT, CEA/DSM/IPhT-CNRS/URA 2306, CEA-Saclay, F-91191 Gif-sur-Yvette, France — 3CPHT, École Polytechnique, CNRS, 91128 Palaiseau Cedex, France

For many strongly correlated systems, the dynamical mean-field theory (DMFT) has proven its value as a numerically feasable and nevertheless physically sound approximation. In combination with the local density approximation (LDA), several material specific phenomena have been successfully studied. However, most of the former LDA+DMFT calculations in a manifest multi-orbital context were restricted to density-density interactions in the many-body hamiltonian and rather high temperatures. These restrictions rendered it difficult to accurately compute susceptibilities that are actually comparable with experimental data.

Due to the novel generation of continuous-time quantum-Monte-Carlo (CT-QMC) impurity solvers, these latter limitations have been lifted. Hence in this talk we want to present the computation of (frequency-dependent) spin susceptibilites for realistic correlated metals using the hybridization-expansion CT-QMC technique [1]. As a concrete example we will discuss the intriguing spin correlations in the strongly correlated NaxCoO2 system.

[1] P. Werner, A. Comanac, L. de’ Medici, M. Troyer and A. J. Millis, Phys. Rev. Lett. 97, 076405 (2006).

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