The NaxTMO2 materials, where TM is a 3d transition metal, are composed of alternating Na and TM layers and exhibit quite a variety of very interesting properties which has resulted in them being extensively investigated. The TM ions occupy an approximately triangular layer providing magnetic frustration and novel spin dynamics. One aspect concerns the Co version of these compounds as the parent materials of the water- intercalated superconductor. The Mn versions are very interesting both for the intriguing spin dynamics and for their potential potential application in rechargeable batteries, as the Na content can be readily varied. Following are publications for the Mn in both areas of interest.
Amplitude mode in a classical, two-dimensional triangular antiferromagnet, Rebecca L. Dally, Yang Zhao, Zhijun Xu, Robin Chisnell, Matthew Stone, Jeffrey W. Lynn, Leon Balents, and Stephen D. Wilson, Nature Communications 9, 2188 (2018).
Reversible Flat to Rippling Phase Transition in Fe Containing Layered Battery Electrode Materials, Xi Chen, Sooyeon Hwang, Robin Chisnell, Yichao Wang, Sooran Kim, Jeffrey W. Lynn, Dong Su, and Xin Li, Adv.Funct. Mater. 28, 1803896 (2018).
Super-charge Separation and High Voltage Phase in NaxMnO2, Xi Chen, Yichao Wang, Kamila Wiaderek, Xiahan Sang, Olaf Borkiewicz, Karena Chapman, James LeBeau, Jeffrey Lynn, and Xin Li, Adv.Funct. Mater. 28, 201805105 (2018).
Thermal evolution of static quasi-1D spin correlations within the anisotropic triangular lattice of a-NaMnO2, Rebecca L. Dally, Robin Chisnell, Leland Harriger, Yaohua Liu, Jeffrey W. Lynn, and Stephen D. Wilson, Phys. Rev. B 98, 144444 (2018).
Floating zone growth of α-Na0.90MnO2 single crystals, Rebecca Dally, Raphaële J. Clémentc, Robin Chisnell, Stephanie Taylor, Megan Butala, Vicky Doan-Nguyen, Mahalingam Balasubramanian, Jeffrey W. Lynn, Clare P. Grey, and Stephen D. Wilson, J. Crystal Growth 459, 203 (2017).
Direct Visualization of the Jahn-Teller Effect Coupled to Na Ordering in Na5/8MnO2, Xin Li, Xiaohua Ma, Dong Su, Lei Liu, Robin Chisnell, Shyue Ping Ong, Hailong Chen, Alexandra Toumar, Juan-Carlos Idrobo, Yuechuan Lei, Jianming Bai, Feng Wang, Jeffrey W. Lynn, Young S. Lee, and Gerbrand Ceder, Nature Materials 13, 586 (2014).