Spin pseudogap in the S=12 chain material Sr2CuO3 with impurities
Abstract
The low energy magnetic excitation spectrum of the Heisenberg antiferromagnetic S = 1/2 chain system Sr2CuO3 with Ni- and Ca-impurities is studied by neutron spectroscopy. In all cases, a defect-induced spectral pseudogap is observed and shown to scale proportionately to the number of scattering centers in the spin chains.
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