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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 Vojta¹ — ¹TU 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(Rh_0.73Co_0.27)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.