Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-10-12
New Journal of Physics 13, 043025 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
Original: 4 pages, 4 figures. Replaced: 8 pages, 4 figures, with updated content and references; [chosen in IOP Select]
Scientific paper
10.1088/1367-2630/13/4/043025
Imaging the magnetic fields around a non-magnetic impurity can provide a clear benchmark for quantifying the degree of magnetic frustration. Focusing on the strongly frustrated $J_1$-$J_2$ model and the spatially anisotropic $J_{1a}$-$J_{1b}$-$J_2$ model, very distinct low energy behaviors reflect different levels of magnetic frustration. In the $J_1$-$J_2$ model, bound magnons appear trapped near the impurity in the ground state and strongly reduce the ordered moments for sites proximal to the impurity. In contrast, local moments in the $J_{1a}$-$J_{1b}$-$J_2$ model are enhanced on the impurity neighboring sites. These theoretical predictions can be probed by experiments such as nuclear magnetic resonance and scanning tunneling microscopy, and the results can elucidate the role of frustration in antiferromagnets and help narrow the possible models to understand magnetism in the iron pnictdies.
Applegate Ryan
Chen Chian-Chou
Devereaux Thomas P.
Moritz Brian
Singh Rajiv R. P.
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