Magnetism, electronic structure and optical properties of TbNiGe2

Sachin Gupta, K. G. Suresh, A. V. Lukoyanov, Yu V. Knyazev, Yu I. Kuz'min

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)

    Abstract

    TbNiGe2 compound crystallizes in the CeNiSi2 type orthorhombic crystal structure and shows antiferromagnetic ordering below 39 K. Magnetization isotherms show linear dependence for field up to 50 kOe. It shows inverse magnetocaloric effect, which is attributed to antiferromagnetic interactions between the moments. The resistivity data was fitted in high and low temperature regimes. The low temperature fit confirms the antiferromagnetic ordering, while the high temperature data follow Bloch-Grüneisen-Mott relation. Ab initio LSDA + U calculations show no spin polarization from Ni 3d electronic states and reproduce the antiferromagnetic long-range ordering of the Tb magnetic moments and their values in good agreement with the previous neutron diffraction data. Optical conductivity data supports the electronic structure calculations and show that it is mostly provided by the transitions involving Ni 3d and Tb 4f electronic states.

    Original languageEnglish
    Pages (from-to)120-124
    Number of pages5
    JournalJournal of Alloys and Compounds
    Volume664
    DOIs
    Publication statusPublished - 2016 Apr 15

    Keywords

    • Antiferromagnet
    • Electronic structure
    • Magnetocaloric effect
    • Optical conductivity

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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