Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.26: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

Numerical evidence for quadrupolar-octopolar order in RETM₂(Al,Zi)₂₀ — •Jan Attig¹, Darrell Tse², Eric Kin-Ho Lee², Arun Paramekanti², and Yong Baek Kim² — ¹Institute for Theoretical Physics, University of Cologne — ²Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada

Motivated by recent experiments on materials of the type RETM₂(Al,Zi)₂₀ (where RE is a rare earth and TM a transition metal element) we investigate a minimal model for the pseudo-spin degrees of freedom of the rare earth ions. The model is described by J1-J2 pseudo-spin interactions in three-dimensions where the XY part models quadrupolar order and the Ising part models octopolar order.

We use various computational methods such as simulating annealing to find the zero temperature phase digram and investigate further by using single-spin flip Monte Carlo simulations for finite temperature. One notable finding is the existence of non-coplanar spiral ordering of pseudo-spins, which may explain some of the experimental data on the electronic ordering in RETM₂(Al,Zi)₂₀.