We report on the nature of the magnetism in Ru substituted MnNiGe using the combined results of x-ray diffraction, dc-magnetization, ac-susceptibility and ab initio calculations. Mn 0.7 Ru 0.3 NiGe crystallizes in Ni 2 In-type hexagonal structure (P6 3 /mmc) at room temperature with lattice parameters a = b = 4.099 and c = 5.367 Å. From the dc-magnetization; a broad peak around 46.55 K, separation between zero-field cooled and field-cooled warming state and non-saturating isothermal magnetization with typical S-type hysteresis indicate glassy behavior. A cusp in is observed to shift toward high temperatures with increasing frequency. Mydosh parameter (), single-relaxation time ( s) obtained through critical slowing-down analysis, from the Vogel-Fulcher law and Tholence criterion , confirm that Mn 0.7 Ru 0.3 NiGe belongs to the short-range interaction spin-glass systems with strong coupling between the magnetic clusters. LSDA+U calculations confirmed the competing exchange interactions between large magnetic moments of the Mn ions in Mn 0.7 Ru 0.3 NiGe compound resulting in the formation of spin-glassy characteristics.
- Heusler alloy
- Mn Ru NiGe