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Spin dynamics and a nearly continuous magnetic phase transition in an entropy-stabilized oxide antiferromagnet | | Benjamin A. Frandsen
; K. Alec Petersen
; Nicolas A. Ducharme
; Alexander G. Shaw
; Ethan J. Gibson
; Barry Winn
; Jiaqiang Yan
; Junjie Zhang
; Michael E. Manley
; Raphaël P. Hermann
; | | Date: |
8 Apr 2020 | | Abstract: | The magnetic order and the spin dynamics in the antiferromagnetic
entropy-stabilized oxide (Mg$_{0.2}$Co$_{0.2}$Ni$_{0.2}$Cu$_{0.2}$Zn$_{0.2}$)O
(MgO-ESO) has been studied using muon spin relaxation ($mu$SR) and inelastic
neutron scattering. We find that antiferromagnetic order develops gradually
throughout the sample volume, beginning around 140 K and becoming fully ordered
around 100 K. The spin dynamics show a critical slowing down as the transition
is approached from above, and the magnetic order parameter as probed by $mu$SR
grows continuously below the transition. These results indicate that the
antiferromagnetic transition in MgO-ESO reaches full percolation and is
continuous, but proceeds throughout the sample with a Gaussian distribution of
ordering temperatures. The magnetic contribution to the specific heat, obtained
by subtracting out the phonon contribution as measured by inelastic neutron
scattering, likewise shows a broad feature centered at approximately 120 K.
High-resolution inelastic neutron scattering further reveals an initially
gapped spectrum at low temperature which sees an increase in a quasielastic
contribution upon heating until the ordering temperature. | | Source: | arXiv, 2004.4218 | | Services: | Forum | Review | PDF | Favorites | |
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