Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at ILL, 71 avenue des Martyrs, 38000 Grenoble, France.
Université Grenoble Alpes, CEA, INAC, MEM, 38000 Grenoble, France.
Phys Rev Lett. 2018 Jun 22;120(25):257205. doi: 10.1103/PhysRevLett.120.257205.
Inelastic neutron scattering measurements are performed on single crystals of the antiferromagnetic compound Mn_{5}Si_{3} in order to investigate the relation between the spin dynamics and the magnetothermodynamics 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 Mn_{5}Si_{3}, the cooling by adiabatic magnetization, is associated with field induced spin fluctuations.
进行了反铁磁化合物 Mn5Si3 的单晶的非弹性中子散射测量，以研究自旋动力学与磁热动力学性质之间的关系。结果表明，在该化合物的两个稳定反铁磁相中，高温相具有异常的磁激发谱，其中传播自旋波和弥散自旋涨落共存。此外，还证明了 Mn5Si3 的反磁热效应，即绝热磁化引起的冷却，与场诱导的自旋涨落有关。
