Observation of large positive magnetoresistance and its sign reversal in GdRhGe

Sachin Gupta, K. G. Suresh, A. K. Nigam

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    Magnetic properties, heat capacity and magnetoresistance (MR) of polycrystalline GdRhGe are investigated. It shows two antiferromagnetic transitions, one at T1 = 31.8 K and the other at T2 = 24 K, and field induced metamagnetic transition over a wide temperature range. The ac susceptibility data reveal that the transition at 24 K is not simple antiferromagnetic. Dominant contributions to the heat capacity and the resistivity have been identified. MR is found to show sign reversal just below T1 and attains a large positive value of 48% at 2 K for 50 kOe. Like MR, the isothermal magnetic entropy change also undergoes a sign reversal as the temperature is varied, indicating a change of the magnetic structure and the moment amplitude in determining these properties.

    Original languageEnglish
    Pages (from-to)600-604
    Number of pages5
    JournalJournal of Alloys and Compounds
    Volume586
    DOIs
    Publication statusPublished - 2014 Jan 1

    Keywords

    • Antiferromagnet
    • Magnetocaloric effect
    • Magnetoresistance
    • Metamagnetic transition

    ASJC Scopus subject areas

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

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