Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice

  title={Disentangling orbital and spin exchange interactions for 
 on a rocksalt lattice},
  author={P M Sarte and Roger Arthur Cowley and Efrain E. Rodriguez and E. Pachoud and Duc-Anh Le and V Garc{\'i}a-Sakai and J. W. Taylor and Christopher D. Frost and Dharmalingam Prabhakaran and Chris MacEwen and Atsushi Kitada and Alexander J. Browne and M Songvilay and Zahra Yamani and William J. L. Buyers and John Paul Attfield and Christopher Stock},
  journal={Physical Review B},
Neutron spectroscopy was applied to study the magnetic interactions of orbitally degenerate Co2+ on a host MgO rocksalt lattice where no long-range spin or orbital order exists. The paramagnetic nature of the substituted monoxide Co0.03Mg0.97O allows for the disentanglement of spin exchange and spin-orbit interactions. By considering the prevalent excitations from Co2+ spin pairs, we extract seven exchange constants out to the fourth coordination shell. An antiferromagnetic next-nearest… 

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