3d-electron Heisenberg pyrochlore Mn2Sb2O7

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American Physical Society
In frustrated magnetic systems, geometric constraints or the competition among interactions introduce extre-mely high degeneracy and prevent the system from readily selecting a low-temperature ground state. The most frustrated known spin arrangement is on the pyrochlore lattice, but nearly all magnetic pyrochlores have unquenched orbital angular momenta, constraining the spin directions through spin-orbit coupling. Pyrochlore Mn2Sb2O7 is an extremely rare Heisenberg pyrochlore system with directionally unconstrained spins and low chemical disorder. We show that it undergoes a spin-glass transition at 5.5 K, which is suppressed by disorder arising from Mn vacancies, indicating this ground state to be a direct consequence of the spins' interactions. The striking similarities to 3d transition-metal pyrochlores with unquenched angular momenta suggests that the low spin-orbit coupling in the 3d block makes Heisenberg pyrochlores far more accessible than previously imagined. ©2016 American Physical Society
Magnetic properties, Pyrochlore, Neutron diffraction, Heat treatments, Spin, Crystal lattices
Peets, D. C., Sim, H., Avdeev, M., & Park, J.-G. (2016). 3d-electron Heisenberg pyrochlore Mn2Sb2O7. Physical Review B, 94(17), 174431. doi:10.1103/PhysRevB.94.174431