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Structure and magnetism of the skyrmion hosting familyGaV4S8−ySeywith low levels of substitutions between0≤y≤0.5and7.5≤y≤8
Physical Review Materials ( IF 3.4 ) Pub Date : 2020-11-17 , DOI: 10.1103/physrevmaterials.4.114413
S. J. R. Holt , A. Štefančič , C. Ritter , A. E. Hall , M. R. Lees , G. Balakrishnan

Polycrystalline members of the GaV4S8ySey family of materials with small levels of substitution between 0y0.5 and 7.5y8 have been synthesized in order to investigate their magnetic and structural properties. Substitutions to the skyrmion hosting parent compounds GaV4S8 and GaV4Se8 are found to suppress the temperature of the cubic-to-rhombohedral structural phase transition that occurs in both end compounds and to create a temperature region around the transition where there is a coexistence of these two phases. Similarly, the magnitude of the magnetization and temperature of the magnetic transition are both suppressed in all substituted compounds until a glassy-like magnetic state is realized. There is evidence from the ac susceptibility data that skyrmion lattices with similar dynamics to those in GaV4S8 and GaV4Se8 are present in compounds with very low levels of substitution, 0<y<0.2 and 7.8<y<8, however, these states vanish at higher levels of substitution. The magnetic properties of these substituted materials are affected by the substitution altering exchange pathways and resulting in the creation of increasingly disordered magnetic states.

中文翻译:

在0≤y≤0.5和7.5≤y≤8之间具有低取代水平的天蝎子宿主家族GaV4S8-ySey的结构和磁性

多晶成员 病毒4小号8-ÿÿ 族之间具有较小替代水平的材料 0ÿ0.57.5ÿ8为了研究它们的磁性和结构特性,已经合成了许多化合物。替代托管母体化合物的天敌病毒4小号8病毒48据发现,它们抑制了在两个末端化合物中均发生的立方-菱形结构相变的温度,并在过渡附近形成了这两个相共存的温度区域。类似地,在所有取代的化合物中,磁化强度和磁化转变温度都被抑制,直到实现玻璃状磁态。从ac磁化率的数据可以看出,天花离子晶格的动力学与硅藻的相似。病毒4小号8病毒48 存在于取代水平非常低的化合物中 0<ÿ<0.27.8<ÿ<8但是,这些状态在较高的替代水平下会消失。这些取代材料的磁性质会受到取代改变交换途径的影响,并导致产生越来越无序的磁态。
更新日期:2020-11-17
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