The effect of longitudinal spin-fluctuations on high temperature properties of Co₃Mn₂Ge

2022/05/31 by Delczeg-Czirjak, Erna K., Eriksson, O., Ruban, A. V. · 1 citation
#Computational Physics (physics.comp-ph) #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci)

paper · doi:10.48550/arxiv.2205.15722

Abstract

It is demonstrated that thermally induced longitudinal spin fluctuations (LSF) play an important role in itinerant Co₃Mn₂Ge at an elevated temperature. The effect of LSF is taken into account during \it ab initio calculations via a simple model for the corresponding entropy contribution. We show that the magnetic entropy leads to the appearance of a medium size local moment on Co atoms. As a consequence, this leads to a renormalization of the magnetic exchange interactions with a quite substantial impact upon the calculated Curie temperature. Taking LSF into account, the calculated Curie temperature can be brought to be in good agreement with the experimental value.

Cited by

• Atomistic spin dynamics with quantum colored noise

Related

• Theoretical justification of the magnetocaloric effect and spontaneous magnetization through critical behavior in Cd-doped MnCoGe alloy
• Effect of Exchange Interaction on Magnetic Thermal Fluctuation and Spin Susceptibility
• Le Chatelier principle and field-induced change in magnetic entropy leading to spin lattice partitioning and magnetization plateau
• High-temperature magnetization and entropy of the triangular lattice Hubbard model in a Zeeman field
• First-principles study of exchange stiffness constant of half-metallic Heusler alloys Co2MnZ (Z= Si, Al) at finite temperatures: Spin fluctuation-induced effective half metallicity