Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
Sci Rep. 2017 Mar 3;7:43767. doi: 10.1038/srep43767.
We report on the syntheses and characterizations of single crystalline and polycrystalline SrCoSO with a novel crystal structure type. It contains Co-O 2-leg rectangular ladders and necklace ladders. The two ladders share common legs and construct a hybrid spin ladder. A rare meridional heteroleptic octahedral coordination is found for the Co ions in the 2-leg ladder. Within the necklace ladders, the Co ions are in trans-octahedral coordination. An antiferromagnetic order is observed at T ~ 267 K, while a broad maximum in magnetic susceptibility is found below T. This relatively high ordering temperature among Co-based ladder compounds is related to the highly anisotropic mer-coordination of the Co ions. The trans-octahedrally coordinated Co ions, on the other hand, corresponds to the possible short-range magnetic correlations through dimers with an effective . This results in a rare situation that spin ordering and spin dimers coexist down to 2 K.
我们报告了具有新型晶体结构类型的单晶和多晶 SrCoSO 的合成和性质研究。它包含 Co-O 2-leg 矩形梯和项链梯。两个梯共享共同的梯腿，并构成混合自旋梯。在 2-leg 梯中的 Co 离子中发现了罕见的子午线杂化八面体配位。在项链梯内，Co 离子呈反式八面体配位。在 T ~ 267 K 时观察到反铁磁有序，而在 T 以下则发现磁感性的宽最大值。在 Co 基梯化合物中，这种相对较高的有序温度与 Co 离子的高各向异性 mer-配位有关。另一方面，反式八面体配位的 Co 离子对应于通过具有有效 的二聚体的可能短程磁关联。这导致了在 2 K 以下自旋有序和自旋二聚体共存的罕见情况。
