Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Glasses (original: DY, joined by DF, CPP)
CPP 13.6: Vortrag
Montag, 31. März 2014, 16:30–16:45, ZEU 146
Spin freezing in geometrically frustrated magnets — Jorge Rehn1, Arnab Sen1,2, •Alexei Andreanov1, Antonello Scardicchio3, Kedar Damle4, and Roderick Moessner1 — 1Max-Planck Institut fur Physik komplexer Systeme, Dresden, Germany — 2Indian Association for the Cultivation of Science, Kolkata, India — 3The Abdus Salam ICTP, Trieste, Italy — 4The Tata Institute, Mumbai, India
Materials which are believed to be faithfully represented by classical frustrated magnets with macroscopically degenerate groundstates, often exhibit spin-freezing. The latter is a transition to a spin-glass phase. Explaining the mechanism of such freezing is not always a simple task, since conventional ingredients, like randomness of the interactions, is not always present in the systems under study. We present a model, where dilution alone generates frustrating interaction between certain spins in the systems and leads to their freezing. The effective model deals with antiferromagnetically coupled Heisenberg spins in 2D. Both the long-range nature of the interaction and its dependence on the distance are crucial for the existence of the glass phase. We confirm our predictions by performing Monte-Carlo simulation of the effective model.