Magnetism and electronic structure of Gd5Ge2Sb: Experiment and theory

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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We report on the magnetic behaviour and electronic structure of partly Sb doped Gd5Ge3 i.e., Gd5Ge2Sb. The compound crystallizes in Mn5Si3-type hexagonal structure with P63/mcm space group. Strong ferromagnetic exchange correlations in the compound can be inferred from the large positive Weiss temperature θW = 143 K. A weak Griffiths phase at TG∼ 213 K, which sustains up to a field of 5 kOe, is observed. Multiple magnetic transitions are observed below 200 K with a strong antiferromagnetic character. The increase of magnetization with a reduction in temperature below Néel transition (TN∼ 136 K), indicates the non-collinear magnetic structure, which is gradually modified to collinear structure in high fields. An incomplete magnetic-field induced transition is discernible from the isothermal magnetization curves. A large electronic coefficient of specific heat γ reveals the metallic behaviour of the compound. The electronic structure was obtained within the GGA + U method accounting for strong correlations in 4f shell of Gd ions. An antiferromagnetic ordering of Gd magnetic moments was found in the calculations which is in agreement with the experimental magnetic measurements results.

Original languageEnglish
Pages (from-to)575-579
Number of pages5
JournalJournal of Alloys and Compounds
Volume806
DOIs
Publication statusPublished - 25 Oct 2019
Externally publishedYes

Keywords

  • Antiferromagnet
  • Electronic structure
  • Gd5Ge2Sb
  • Magnetization
  • Non-collinear
  • Specific heat

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