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Lattice vibrations boost demagnetization entropy in shape memory alloy

Magnetocaloric (MC) materials present an avenue for chemical-free, solid state refrigeration through cooling via adiabatic demagnetization. We have used inelastic neutron scattering to measure the lattice dynamics in the MC material Ni45Co5Mn36.6In13.4. Upon heating across the Curie Temperature (TC), the material exhibits an anomalous increase in phonon entropy of 0.22 +/- 0.04 kB/atom, which is ten times larger than expected from conventional thermal expansion. This transition is accompanied by an abrupt softening of the transverse optic phonon. We present first-principle calculations showing a strong coupling between lattice distortions and magnetic excitations.

preprint2015arXivOpen access
Paul StonahaMike ManleyNick BrunoIbrahim KaramanRaymundo ArroyaveNavdeep SinghDouglas AbernathySongxue Chi
cond-mat.mtrl-sci
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Paul StonahaMike ManleyNick BrunoIbrahim KaramanRaymundo ArroyaveNavdeep SinghDouglas AbernathySongxue Chi

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