Evidence for multimagnon-mediated nuclear spin relaxation in the intertwining double-cain ferrimagnet Ca₃ Cu₃ (PO₄)₄
classification
❄️ cond-mat.str-el
cond-mat.stat-mech
keywords
nuclearprocessesrelaxationspintimecompoundcontributiondouble-cain
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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 $1/T_1$.
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