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Field-Induced Superparamagnetic Spin Dynamics in Tb i-MAX Compounds

Frequency-dependent ac susceptibility on the (Mo2/3Tb1/3)2AlC i-MAX compound reveals a field-induced superparamagnetic state, distinguished from a canonical spin glass by a large Mydosh parameter (~0.168), that coexists with an incommensurate spin-density wave. Relaxation times follow a double-Arrhenius temperature dependence, marking Tb-i as a transitional member of the i-MAX family between spin-stable and fluctuation-dominated compounds.

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Field-induced spin dynamics in i-MAX Tb compound Dror Yahav,1 Daniel Potashnikov,2 Asaf Pesach,2

An ac magnetic susceptibility study of the (Mo2/3Tb1/3)2AlC i-MAX compound, an in-plane-ordered nanolaminated material in which terbium's localized 4f moments sit on a triangular rare-earth sublattic…