Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 109: Frustrated Magnets - (General) Theory
TT 109.4: Vortrag
Freitag, 16. März 2018, 10:15–10:30, H 3005
Quenched bond disorder in a non-collinear antiferromagnet — •Santanu Dey and Matthias Vojta — Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany
In antiferromagnets, the presence of geometric frustration often leads to classical ground states with non-collinear spin ordering. Quenched disorder is an interesting ingredient which tends to counteract spontaneous symmetry breaking in low dimensional systems. Consequently, the study of the interplay between disorder and frustration has garnered some serious attention recently [1,2]. To understand the resulting phenomena, we undertake a generic point of view and also focus on a prototypical example, the disordered triangular lattice antiferromagnet (TLAF) with next and next to nearest neighbor Heisenberg interaction. The homogeneous limit of this model hosts a phase transition between non-collinear antiferromagnetic LRO and what is believed to be a Z2 spin liquid [3]. Combining analytical arguments and finite-system numerical simulations, we study the destruction of the LRO by bond disorder and discuss physical properties of the emergent state at low temperatures. We also connect our findings to recent experimental observations on related compounds, YbZnGaO4 and YbMgGaO4 [1].
Z. Ma et. al, arXiv:1709.00256 (2017)
H. Kawamura, K. Watanabe, T. Shimokawa, J. Phys. Soc. Jpn. 83, 103704 (2014)
K. Slagle and C. Xu, Phys. Rev. B. 89, 104418 (2014)