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Whirling spin order in the quasicrystal approximant Au₇₂Al₁₄Tb₁₄

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arxiv 1904.13008 v1 pith:BJX7VSYT submitted 2019-04-30 cond-mat.mtrl-sci

Whirling spin order in the quasicrystal approximant Au₇₂Al₁₄Tb₁₄

classification cond-mat.mtrl-sci
keywords icosahedralorderspinwhirlingapproximantclustersquasicrystaltransition
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Neutron powder diffraction experiment has been performed on the quasicrystal approximant Au$_{72}$Al$_{14}$Tb$_{14}$, a body-center-cubic crystal of icosahedral spin clusters. The long-range antiferromagnetic order was confirmed at the transition temperature $T_{\rm N} = 10.4$ K. The magnetic structure consists of noncoplanar whirling spins on the icosahedral clusters, arranging antiferroic-manner. A simple icosahedral spin-cluster model with uniaxial anisotropy accounts well the whirling spin order as well as the in-field metamagnetic transition, indicating that the icosahedral symmetry is essential.

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