The anti-invar effect in Y6Mn1-xSix compound system has been investigated and the results are compared with those in Y6(Mn1-xMx)23 compounds (M = Al, Fe). From the relation between the Curie temperature TC and the thermal expansion coefficient α, α is larger in M = Si than in M = Fe and Al for the compounds of the same TC. The present results strongly imply that the Si substitution results in the reduction of the exchange interaction without a strong change in the intra-atomic Coulomb interaction.
- Anti-invar effect
- Intra-atomic Coulomb interaction
- Spin fluctuation
- Thermal expansion anomaly
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics