Spin-coupling topology in the copper hexamer compounds A_2Cu_3O(SO_4)_3 (A=Na, K)

A. Furrer; A. Podlesnyak; J. M. Clemente-Juan; E. Pomjakushina; H. U. Guedel

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Spin-coupling topology in the copper hexamer compounds A_2Cu_3O(SO_4)_3 (A=Na, K)

机译：铜六聚合物化合物中的旋转耦合拓扑A_2Cu_3O（SO_4）_3（a = Na，k）

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The compounds A_2Cu_3O(SO_4)_3 (A = Na, K) are characterized by copper hexamers that are weakly coupled to realize ami ferromagnetic order below T_N ≈ 3K. They constitute quantum spin systems with S = 1 triplet ground states. We investigated the energy-level splittings of the copper hexamers by inelastic neutron scattering experiments covering the entire range of the magnetic excitation spectra. The observed transitions are governed by very unusual selection rules that we ascribe to the underlying spin-coupling topology. This is rationalized by model calculations that allow an unambiguous interpretation of the magnetic excitations concerning both the peak assignments and the nature of the spin-coupling parameters.

机译：化合物A_2CU_3O（SO_4）_3（A = Na，K）的特征在于弱耦合以实现下方的AMI铁磁序列≈3K。它们构成具有S = 1个三联地面态的量子旋转系统。我们通过覆盖磁激散谱的整个范围的内核间散射实验来研究铜六辐射的能量水平分配。观察到的过渡受到我们归于潜在的自旋耦合拓扑的非常不寻常的选择规则。这是通过模型计算合理化，该模型计算允许对峰值分配的磁激发和自旋耦合参数的性质的磁激励进行明确解释。

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《Physical review》 |2020年第22期|224417.1-224417.9|共9页
作者
A. Furrer; A. Podlesnyak; J. M. Clemente-Juan; E. Pomjakushina; H. U. Guedel;
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Laboratory for Neutron Scattering Paul Scherrer Institut CH-5232 Villigen PSI Switzerland;

Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA;

Instituto de Ciencia Molecular (ICMol) Universitat de Valencia c/Catedratico Jose Beltran 2 46980 Paterna Spain;

Laboratory for Multiscale Materials Experiments Paul Scherrer Institut CH-5232 Villigen PSI Switzerland;

Department of Chemistry and Biochemistry University of Bern CH-3000 Bern 9 Switzerland;

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Spin-coupling topology in the copper hexamer compounds A_2Cu_3O(SO_4)_3 (A=Na, K)

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