Structure and Physical Properties of Ruddlesden-Popper type structures LnACrO4 (Ln = La, Y; A = Sr, Ca)
Ting-Hui Kao1,2*, Hiroya Sakurai2, Taras Kolodiazhnyi2, Yutaro Suzuki3, Momoko Okabe3, Toru Asaka3, Koichiro Fukuda3, Susumu Okubo4, Shohei Ikeda5, Shigeo Hara6, Takahiro Sakurai6, Hitoshi Ohta4,5, Hung-Duen Yang1
1Department of Physics, National Sun-Yet Sen University, Kaohsiung 804, Taiwan
2National Institute for Materials Science, Tsukuba 305-0044, Japan
3Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-855, Japan
4Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan
5Graduate School of Science, Kobe University, Kobe 657-8501, Japan
6Center for Supports to Research and Education Activities, Kobe University, Kobe 657-8501, Japan
* presenting author:Ting-Hui Kao,
Ruddlesden-Popper (RP) type structure have been attracted much attention due to their interesting physical properties. K2NiF4 type structure is the n = 1 case of RP structure. The physical properties of YSrCrO4, YCaCrO4 and LaSrCrO4 were studied in our work. YSrCrO4 is first synthesized and found to be a hettotype of K2NiF4 structure. The space group of YSrCrO4 is determined to be orthorhombic Pccn by the electron diffraction and the powder X-ray diffraction. Magnetic properties of the compound, together with LaSrCrO4 and YCaCrO4 are investigated. YSrCrO4 shows two-dimensional (2D) spin correlations and a canted antiferromagnetic (AF) ordering. From the multi-frequency electron spin resonance (ESR) measurements, the g-values of paramagnetic state are estimated to be 1.976, 1.978 and 1.976 for YSrCrO4, LaSrCrO4 and YCaCrO4, respectively. Evidence of AF ordering of the Cr oxides is obtained microscopically from ESR. In the presentation, we will discuss the relation between crystal structure and magnetic transition temperature or spontaneous magnetization.

Keywords: Ruddlesden-Popper type structure, Antiferromagnetic