Spin-fluctuations drive the inverse magnetocaloric effect in Mn5Si3
N. Biniskos, K. Schmalzl, S. Raymond, S. Petit, P. Steffens, J., Persson, and T. Brueckel
TL;DR
This study reveals that in Mn5Si3, the inverse magnetocaloric effect is driven by field-induced spin-fluctuations, linked to unique spin dynamics observed through neutron scattering.
Contribution
It demonstrates the connection between spin-fluctuations and the inverse magnetocaloric effect in Mn5Si3, highlighting the role of spin dynamics in magneto-thermodynamic properties.
Findings
High-temperature phase exhibits coexistence of spin-waves and diffuse spin-fluctuations.
Inverse magnetocaloric effect is associated with field-induced spin-fluctuations.
Spin dynamics are crucial for understanding magnetocaloric phenomena in Mn5Si3.
Abstract
Inelastic neutron scattering measurements were performed on single crystals of the antiferromagnetic compound Mn5Si3 in order to investigate the relation between the spin dynamics and the magneto-thermodynamic properties. It is shown that among the two stable antiferromagnetic phases of this compound, the high temperature one has an unusual magnetic excitation spectrum where propagative spin-waves and diffuse spin-fluctuations coexist. Moreover, it is evidenced that the inverse magnetocaloric effect of Mn5Si3, the cooling by adiabatic magnetization, is associated with field induced spin-fluctuations.
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