Origin of the unusual strong suppression of low frequency antiferromagnetic fluctuations in underdoped HgBa${}_2$CuO${}_{4+\delta }$

Abstract

Generally strong charge and magnetic inhomogeneities are observed in NQR/NMR experiments on underdoped cuprates. It is not the case for the underdoped HgBa${}_2$CuO${}_{4+\delta }$, the most symmetric and highest T${}_c$ single layer cuprate, whose magnetic inhomogeneity is strongly suppressed. Also neutron scattering experiments reveal a unique pair of weakly dispersive magnetic modes in this material. We propose that these special properties stem from the symmetric positioning of the O-dopants between adjacent CuO${}_2$ layers that lead to a strong superexchange interaction between a pair of hole spins. In this Letter we present a theoretical model, which gives a consistent explanation to the anomalous magnetic properties of this material.

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References in corpus (4)

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