Spin Glass Behavior in Spinel Ni0.8Fe2.2O4

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.

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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