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Abstract:
We report selected experimental results on the spin dynamics and spin
freezing at ferromagnetic quantum phase transitions to illustrate some
of the most prominent escape routes by which ferromagnetic quantum
criticality is avoided in real materials. In the transition metal
Heusler compound Fe2TiSn we observe evidence for incipient ferromagnetic
quantum criticality. High pressure studies in MnSi reveal empirical
evidence for a topological non-Fermi liquid state without quantum
criticality. Single crystals of the hexagonal Laves phase compound Nb1-y
Fe2+y provide evidence of a ferromagnetic to spin density wave
transition as a function of slight compositional changes. Last but not
least, neutron depolarisation imaging in CePd1-x Rh (x) underscore
evidence taken from the bulk properties of the formation of a Kondo
cluster glass.
