Direct Visualization of Magnetic Correlations in Frustrated Spinel ZnFe2O4

Jonas Ruby Sandemann, Thomas Bjørn Egede Grønbech, Kristoffer Andreas Holm Støckler, Feng Ye, Bryan C. Chakoumakos, Bo Brummerstedt Iversen*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Magnetic materials with the spinel structure (A2+B3+2O4) form the core of numerous magnetic devices, and ZnFe2O4 constitutes a peculiar example where the nature of the magnetism is still unresolved. Susceptibility measurements revealed a cusp around Tc = 13 K resembling an antiferromagnetic transition, despite the positive Curie–Weiss temperature determined to be ΘCW = 102.8(1) K. Bifurcation of field-cooled and zero-field-cooled data below Tc in conjunction with a frequency dependence of the peak position and a non-zero imaginary component below Tc shows it is in fact associated with a spin-glass transition. Highly structured magnetic diffuse neutron scattering from single crystals develops between 50 K and 25 K revealing the presence of magnetic disorder which is correlated in nature. Here, the 3D-mΔPDF method is used to visualize the local magnetic ordering preferences, and ferromagnetic nearest-neighbor and antiferromagnetic third nearest-neighbor correlations are shown to be dominant. Their temperature dependence is extraordinary with some flipping in sign and a strongly varying correlation length. The correlations can be explained by orbital interaction mechanisms for the magnetic pathways and a preferred spin cluster. This study demonstrates the power of the 3D-mΔPDF method in visualizing complex quantum phenomena thereby providing a way to obtain an atomic-scale understanding of magnetic frustration.

Original languageEnglish
Article number2207152
JournalAdvanced Materials
Volume35
Issue5
Number of pages9
ISSN0935-9648
DOIs
Publication statusPublished - Feb 2023

Keywords

  • frustrated magnetism
  • magnetic pair distribution function
  • neutron scattering
  • spin-glass

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