Spin-orbit transitions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math>- and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>γ</mml:mi><mml:mo>−</mml:mo><mml:msub><mml:mi>CoV</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>

Wallington, F.; Arévalo‐López, Ángel M.; Taylor, Jonathan; Stewart, J. R.; Sakai, Victoria García; Attfield, J. Paul; Stock, C.

doi:10.1103/physrevb.92.125116

Cited by 29 publications

(53 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Given the powder average na- ture of the dynamics (discussed below), we are not sensitive to this term. However, the consistency of the inelastic response with the j eff description discussed above in terms of the energy response is also consistent with other Co 2+ -based magnets where a local distortions of the octahedra exists 60,95 . We now discuss further evidence for our interpretation in terms of j eff levels by applying the sum rules of neutron scattering to the integrated inelastic scattering intensity.…”

Section: Spin-orbit Transitionssupporting

confidence: 87%

“…The small θ CW with an average θ CW = −3.2(4) K is suggestive of either weak exchange interactions or the presence of multiple and nearly canceling ferro/antiferromagneic interactions resulting in the experimentally observed small average. The differences in the constants measured along different directions is also indicative of an anisotropy in the system likely originating from the distortion of the local octahedra 60,75 .…”

Section: B DC Magnetic Susceptibilitymentioning

confidence: 98%

“…5(a) and (b). Such a gap would be a consequence of the Zeeman splitting of the j eff = 1 2 manifold due to the internal molecular field caused by long range ordering in the Néel phase 60 . Once the temperature is raised above T N , the molecular field would be significantly reduced due to the loss of magnetic order, resulting in the disappearance of a gap, as is experimentally observed in Fig.…”

Section: Spin-orbit Transitionsmentioning

confidence: 99%

“…as derived in Appendix C, where n ij , J ij , Ŝ i ·Ŝ j and d ij denote the number of individual exchange interactions, the exchange constant, the spin-spin correlator and the displacement vector between spins at sites i and j, respectively 60,102,146 .…”

Section: F First Moment Sum Rule Local Cation Ordering and Single Modmentioning

confidence: 99%

“…3(g) corresponds to excitations within the ground state j eff = 1 2 , proven by the total moment sum rule, then the single mode approximation (SMA) can be applied 102,147 . The single mode approximation, applicable to a situation where the excitation spectrum is dominated a single coherent mode, allows for the dynamic structure factor to be written as S(Q, E) = S(Q)δ[ (Q) − E], where δ[ (Q) − E] assures energy conservation 60,87,100,124,148 . Applying the single mode approximation to the first moment sum rule yields…”

Section: F First Moment Sum Rule Local Cation Ordering and Single Modmentioning

confidence: 99%

See 4 more Smart Citations

Ordered magnetism in the intrinsically decorated jeff=12α−CoV3O8

et al. 2018

Self Cite

View full text Add to dashboard Cite

The antiferromagnetic mixed valence ternary oxide α-CoV3O8 displays disorder on the Co 2+ site that is inherent to the Ibam space group resulting in a local selection rule requiring one Co 2+ and one V 4+ reside next to each other, thus giving rise to an intrinsically disordered magnet without the need for any external influences such as chemical dopants or porous media. The zero field structural and dynamic properties of α-CoV3O8 have been investigated using a combination of neutron and x-ray diffraction, DC susceptibility, and neutron spectroscopy. The low temperature magnetic and structural properties are consistent with a random macroscopic distribution of Co 2+ over the 16k metal sites. However, by applying the sum rules of neutron scattering we observe the collective magnetic excitations are parameterized with an ordered Co 2+ arrangement and critical scattering consistent with a three dimensional Ising universality class. The low energy spectrum is well-described by Co 2+ cations coupled via a three dimensional network composed of competing ferromagnetic and stronger antiferromagnetic superexchange within the ab plane and along c, respectively. While the extrapolated Weiss temperature is near zero, the 3D dimensionality results in long range antiferromagnetic order at T N ∼ 19 K. A crystal field analysis finds two bands of excitations separated in energy at ω ∼ 5 meV and 25 meV, consistent with a j eff = 1 2 ground state with little mixing between spin-orbit split Kramers doublets. A comparison of our results to the random 3D Ising magnets and other compounds where spin-orbit coupling is present indicate that the presence of an orbital degree of freedom, in combination with strong crystal field effects and well-separated j eff manifolds may play a key role in making the dynamics largely insensitive to disorder.

show abstract

Section: Spin-orbit Transitionssupporting

confidence: 87%

Section: B DC Magnetic Susceptibilitymentioning

confidence: 98%

Section: Spin-orbit Transitionsmentioning

confidence: 99%

Section: F First Moment Sum Rule Local Cation Ordering and Single Modmentioning

confidence: 99%