Revealing the degree of magnetic frustration by non-magnetic impurities

Abstract

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.

arXiv commentOriginal: 4 pages, 4 figures. Replaced: 8 pages, 4 figures, with updated content and references; [chosen in IOP Select]

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Cited by in corpus (7)

• Anisotropic Impurity-States, Quasiparticle Scattering and Nematic Transport in Underdoped Ca(Fe1-xCox)2As2
• Triangular antiferromagnet with nonmagnetic impurities
• Emergent defect states as a source of resistivity anisotropy in the nematic phase of iron pnictides
• Origin of electronic dimers in the spin-density wave phase of Fe-based superconductors
• Anticollinear magnetic order induced by impurities in the frustrated Heisenberg model of pnictides
• Collective impurity effects in the Heisenberg triangular antiferromagnet
• Emergence of novel magnetic order at finite temperature in overdoped pnictides