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Single-ion properties of the S = 1/2 XY antiferromagnetic pyrochlores, NaA’Co2F7 (A’ = Ca2+, Sr2+)

Single-ion properties of the S = 1/2 XY antiferromagnetic pyrochlores, NaA’Co2F7 (A’ = Ca2+, Sr2+)

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Our paper on the single ion properties of Cobalt-based S=1/2 pyrochlores NaCaCo2F7 and NaSrCo2F7 was published in PRB as an editors suggestion.  Based on inelastic neutron scattering, from which we can extract the single ion angular momentum wavefunctions and thus their g-tensor anisotropies, we show that these materials are good examples of the S=1/2 XY antiferromagnetic pyrochlore model with exchange disorder.  This model is currently being discussed in the context of “order by disorder” and these pyrochlores appear to be a counter-example to this phenomenon.