Revelation of spin glass behavior in Ru doped MnNiGe: Experiment and theory

S. Shanmukharao Samatham, Akhilesh Kumar Patel, A. V. Lukoyanov, K. G. Suresh

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number125803
JournalJournal of Physics Condensed Matter
Volume31
Issue number12
DOIs
Publication statusPublished - 1 Feb 2019
Externally publishedYes

Keywords

  • Heusler alloy
  • magnetization
  • Mn Ru NiGe
  • spinglass
  • susceptibility

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