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Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 59: Correlated Electrons: Quantum-Critical Phenomena - Experiments

TT 59.9: Vortrag

Donnerstag, 14. März 2013, 17:30–17:45, H6

Competing Magnetic Anisotropies and Multicriticality: The Case of Co-doped YbRh2Si2 — •Eric C. Andrade1, Manuel Brando2, Christoph Geibel2, and Matthias Vojta11TU Dresden — 2MPI-CPfS

Motivated by the unusual evolution of magnetic phases in stoichiometric and Co-doped YbRh2Si2, we study Heisenberg models with competing single-ion and exchange anisotropies by large scale Monte-Carlo simulations. Upon also including the competition between ferromagnetic and antiferromagnetic order, we analyze the ingredients required to obtain the characteristic crossing point of susceptibilities observed experimentally in Yb(Rh0.73Co0.27)2Si2. The models possess various multicritical points, which we speculate to be relevant for the behavior of Co-doped YbRh2Si2. We also make contact with experimental data on YbNi2P4.

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