Spin Glass Behavior in Spinel Ni<sub>0.8</sub>Fe<sub>2.2</sub>O<sub>4</sub>

ORAL

Abstract

Spinel oxides (AB2O4) with magnetic A and B ions are known to exhibit complex magnetic behavior that emerge from the competing AA, AB, and BB magnetic interactions. Here, we report the magnetic and thermal properties of single-crystalline Ni0.8Fe2.2O4, which orders ferrimagnetically (FI) below TFI ~ 860 K, followed by another magnetic transition at TSG ~ 14 K. The dc magnetization shows a dramatic downturn upon cooling below TSG, whereas both real and imaginary parts of ac susceptibility show frequency dependence. Further quantitative analysis reveals the presence of de Almeida-Thouless (A-T) line, dynamic magnetization behavior, memory effect, and the critical power law dependence of transition temperature to ac frequency, all indicative of a spin glass ground state. The origin of the spin glass state and its implication to other physical properties will be discussed.

*This work is supported by DoE through DE-SC0016315.

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Presenters

  • Roshan Nepal

    • Louisiana State University
    • Physics and Astronomy, Louisiana State University

Authors

  • Roshan Nepal

    • Louisiana State University
    • Physics and Astronomy, Louisiana State University

  • Mohammad Saghayezhian

    • Department of Physics and Astronomy, Baton Rouge, Louisiana 70803, US, Louisiana State University
    • Louisiana State University
    • Department of Physics & Astronomy, Louisiana State University
    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge
    • Physics and astronomy, Louisiana State University

  • Jiandi Zhang

    • Department of Physics and Astronomy, Baton Rouge, Louisiana 70803, US, Louisiana State University
    • Louisiana State University
    • Department of Physics & Astronomy, Louisiana State University
    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge
    • Physics and astronomy, Louisiana State University

  • Rongying Jin

    • Louisiana State University
    • Physics, Louisiana State University
    • Physics and astronomy, Louisiana State University
    • 2Condensed Matter Physics and Materials Science Departement, Brookhaven National Laboratory
    • Department of Physics and Astronomy, Louisiana State University
    • Physics and Astronomy, Louisiana State University