Evidence for multimagnon-mediated nuclear spin relaxation in the intertwining double-cain ferrimagnet $C{a}_{3}C{u}_3(P{O}_4{)}_4$

Abstract

The nuclear spin-lattice relaxation time $T_1$ of ${}^{31}P$ 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 $1/T_1$.

6 pages with 7 figures embedded

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Cited by in corpus (2)

• Low-energy structure of the intertwining double-chain ferrimagnets A_3_Cu_3_(PO_4_)_4_ (A=Ca,Sr,Pb)
• Spin-wave thermodynamics of square-lattice antiferromagnets revisited