Spin excitations in stripe-ordered La2-xSrxNiO4 (x=0.275 and 1/3)
A. T. Boothroyd, P. G. Freeman, D. Prabhakaran, H. Woo, K. Nakajima, J. M. Tranquada, K. Yamada, C. D. Frost
Abstract
We report neutron scattering measurements of the spectrum of magnetic excitations in the stripe-ordered phase of La2-xSrxNiO4 (x=0.275 and 1/3). The propagating spin excitations follow a similar dispersion relation for the two compositions, but the line widths are broader for x=0.275 than for x=1/3.
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