Balz Christian, Lake Bella, Reehuis Manfred, Nazmul Islam A T M, Prokhnenko Oleksandr, Singh Yogesh, Pattison Philip, Tóth Sándor
Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany. Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany. Present address: Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States of America.
J Phys Condens Matter. 2017 Jun 7;29(22):225802. doi: 10.1088/1361-648X/aa68eb. Epub 2017 Mar 24.
A detailed diffraction study of CaCrO is presented which adds significant new insights into the structural and magnetic properties of this compound. A new crystal structure type was used where the a and b axes are doubled compared to previous models providing a more plausible structure where all crystallographic sites are fully occupied. The presence of two different valences of chromium was verified and the locations of the magnetic Cr and non-magnetic Cr ions were identified. The Cr ions have spin-[Formula: see text] and form distorted kagome bilayers which are stacked in an ABC arrangement along the c axis. These results lay the foundation for understanding of the quantum spin liquid behavior in CaCrO which has recently been reported in Balz et al (2016 Nat. Phys. 12 942).
本文对CaCrO进行了详细的衍射研究，为该化合物的结构和磁性特性提供了重要的新见解。采用了一种新的晶体结构类型，其中a轴和b轴与先前模型相比加倍，提供了一个更合理的结构，所有晶体学位置都被完全占据。证实了铬存在两种不同的价态，并确定了磁性Cr离子和非磁性Cr离子的位置。Cr离子具有自旋-[公式：见正文]，形成扭曲的 Kagome 双层，沿c轴以ABC排列堆叠。这些结果为理解CaCrO中的量子自旋液体行为奠定了基础，Balz等人（2016年《自然·物理学》12 942）最近报道了这种行为。
