MnTaO2N: Polar LiNbO3-type Oxynitride with a Helical Spin Order
Dr. Cédric Tassel, Yoshinori Kuno, Yoshihiro Goto, Dr. Takafumi Yamamoto, Dr. Craig M. Brown, Dr. James Hester, Dr. Koji Fujita, Dr. Masanobu Higashi, Prof. Ryu Abe, Prof. Katsuhisa Tanaka, Dr. Yoji Kobayashi and Prof. Hiroshi Kageyama
Article first published online: 21 NOV 2014 | DOI: 10.1002/anie.201408483
Under pressure: The first LiNbO3-type oxynitride, MnTaO2N, has been synthesized using a high-pressure technique (see picture). Contrary to conventional ammonolysis reaction, this approach allows to obtain an oxynitride with a middle-to-late transition metal. MnTaO2N is non-centrosymmetric unlike most oxynitrides and exhibits a nontrivial helical spin ordering below 25 K.