English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The antiferromagnetic mixed valence ternary oxide $\alpha$-CoV$_{3}$O$_{8}$displays disorder on the Co$^{2+}$ site that is inherent to the $Ibam$ spacegroup. The zero field structural and dynamic properties of$\alpha$-CoV$_{3}$O$_{8}$~have been investigated using a combination of neutronand x-ray diffraction, DC susceptibility, and neutron spectroscopy. The lowtemperature magnetic and structural properties are consistent with a randommacroscopic distribution of Co$^{2+}$ over the 16$k$ metal sites. However, byapplying the sum rules of neutron scattering we observe the collective magneticexcitations are parameterized with an ordered Co$^{2+}$ arrangement andcritical scattering consistent with a three dimensional Ising universalityclass. The low energy spectrum is well-described by Co$^{2+}$ cations coupled$via$ a three dimensional network composed of competing ferromagnetic andstronger antiferromagnetic superexchange within the $ab$ plane and along $c$,respectively. While the extrapolated Weiss temperature is near zero, the 3Ddimensionality results in long range antiferromagnetic order at$T\rm{_{N}}\sim$ 19 K. A crystal field analysis finds two bands of excitationsseparated in energy at $\hbar \omega$ $\sim$ 5 meV and 25 meV, consistent witha $j\rm{_{eff}}=\frac{1}{2}$ ground state with little mixing between spin-orbitsplit Kramers doublets. A comparison of our results to the random 3D Isingmagnets and other compounds where spin-orbit coupling is present indicate thatthe presence of an orbital degree of freedom, in combination with strongcrystal field effects and well-separated $j\rm{_{eff}}$ manifolds may play akey role in making the dynamics largely insensitive to disorder.

Ordered magnetism in the intrinsically decorated $j\rm{_{eff}}$ = $\frac{1}{2}$ $\alpha$-CoV$_{3}$O$_{8}$