Polarized neutron investigation of the magnetic excitation spectrum of the inverse magnetocaloric compound Mn5Si3
Mn5Si3 has attracted interest for exhibiting an inverse magnetocaloric effect that corresponds to the cooling by adiabatic magnetization. This effect is opposite to the more common direct magnetocaloric effect, the cooling by adiabatic demagnetization. Using inelastic neutron scattering (INS), we have shown that, among the two stable antiferromagnetic phases of this compound, the high temperature one (AF2) is characterized by an unusual magnetic excitation spectrum where propagative spin waves and diffuse spin fluctuations coexist. Moreover, it was evidenced that the inverse magnetocaloric effect of Mn5Si3 is associated with field induced spin fluctuations. Polarized neutron scattering experiments provided an essential input to reach these conclusions. In order to further separate spin-waves from spin fluctuations in the full energy range of the dynamical magnetic response, it is proposed to carry out a polarized INS investigation of the AF2 state in the energy range 0.2-3 meV at zero field. Beyond providing a complete microscopic landscape of this peculiar spin dynamics, this will allow to consistently analyze the unpolarized INS data obtained as a function of magnetic field.
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RAYMOND Stephane; BINISKOS Nikolaos; SCHMALZL Karin and STEFFENS Paul. (2019). Polarized neutron investigation of the magnetic excitation spectrum of the inverse magnetocaloric compound Mn5Si3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1618
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