3d-electron Heisenberg pyrochlore Mn2Sb2O7

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Title
3d-electron Heisenberg pyrochlore Mn2Sb2O7
Author(s)
Darren C. Peets; Hasung Sim; Maxim Avdeev; Je-Geun Park
Publication Date
2016-11
Journal
PHYSICAL REVIEW B, v.94, no.17, pp.174431 -
Publisher
AMER PHYSICAL SOC
Abstract
In frustrated magnetic systems, geometric constraints or the competition among interactions introduce extremely 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
URI
https://pr.ibs.re.kr/handle/8788114/3036
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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