Magnetic fluctuations in frustrated Laves hydrides R(Mn_{1-x}Al_{x})_{2}H_{y}

TL;DR

This study uses neutron scattering to investigate spin correlations and fluctuations in frustrated Laves hydrides, revealing complex magnetic behavior including static clusters and dynamic fluctuations related to magnetic inhomogeneities.

Contribution

It provides new insights into the nature of spin dynamics and magnetic inhomogeneities in frustrated Laves hydrides through detailed neutron scattering analysis.

Findings

Presence of static spin clusters coexisting with fluctuating spins

Identification of two processes: relaxation and local excitations

Comparison of fluctuations with classical spin glasses and non Fermi liquids

Abstract

By neutron scattering, we have studied the spin correlations and spin fluctuations in frustrated Laves hydrides, where magnetic disorder sets in the topologically frustrated Mn lattice. Below the transition towards short range magnetic order, static spin clusters coexist with fluctuating and alsmost uncorrelated spins. The magnetic response shows a complexe lineshape, connected with the presence of the magnetic inhomogeneities. Its analysis shows the existence of two different processes, relaxation and local excitations, for the spin fluctuations below the transition. The paramagnetic fluctuations are discussed in comparison with classical spin glasses, cluster glasses, and non Fermi liquid itinerant magnets.