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Ferrimagnetic 120∘magnetic structure inCu2OSO4
Physical Review B ( IF 3.7 ) Pub Date : 2020-09-18 , DOI: 10.1103/physrevb.102.094422
Virgile Yves Favre , Gregory S. Tucker , Clemens Ritter , Romain Sibille , Pascal Manuel , Matthias D. Frontzek , Markus Kriener , Lin Yang , Helmuth Berger , Arnaud Magrez , Nicola P. M. Casati , Ivica Živković , Henrik M. Rønnow

We report magnetic properties of a 3d9 (Cu2+) magnetic insulator Cu2OSO4 measured on both powder and single crystal. The magnetic atoms of this compound form layers whose geometry can be described either as a system of chains coupled through dimers or as a kagome lattice where every third spin is replaced by a dimer. Specific heat and DC susceptibility show a magnetic transition at 20 K, which is also confirmed by neutron scattering. Magnetic entropy extracted from the specific heat data is consistent with an S=1/2 degree of freedom per Cu2+, and so is the effective moment extracted from DC susceptibility. The ground state has been identified by means of neutron diffraction on both powder and single crystal and corresponds to an 120 spin structure in which ferromagnetic intradimer alignment results in a net ferrimagnetic moment. No evidence is found for a change in lattice symmetry down to 2 K. Our results suggest that Cu2OSO4 represents a type of model lattice with frustrated interactions where interplay between magnetic order, thermal and quantum fluctuations can be explored.

中文翻译:

Cu2OSO4中的亚铁磁性120∘磁性结构

我们报告了 3d9 2+ 磁绝缘子 2OSO4在粉末和单晶上测量。该化合物的磁性原子形成的层的几何形状可以描述为通过二聚体偶联的链体系,也可以描述为kagome晶格,其中每三个自旋都被二聚体取代。比热和直流磁化率在20 K处显示出磁跃迁,这也由中子散射证实。从比热数据中提取的磁熵与小号=1个/2 每个自由度 2+,从直流磁化率中提取的有效矩也是如此。基态已经通过中子在粉末和单晶上的衍射进行了鉴定,并且对应于120自旋结构,其中铁磁二聚体排列会导致净铁磁矩。没有证据表明晶格对称性降低至2K。我们的结果表明2OSO4 代表一种具有受挫相互作用的模型晶格,其中可以探索磁阶,热和量子涨落之间的相互作用。
更新日期:2020-09-20
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