Evidence for multimagnon-mediated nuclear spin relaxation in the intertwining double-cain ferrimagnet Ca3 Cu3 (PO4)4
Abstract
The nuclear spin-lattice relaxation time T1 of 31P nuclei in the title compound is measured for the first time and interpreted in terms of a modified spin-wave theory. We establish a novel scenario for one-dimensional ferrimagnetic spin dynamics -- it is three-magnon processes enhanced by exchange scattering, rather than Raman processes, that make the major contribution to 1/T1.
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