X-ray absorption studies of Ni3TeO6 single crystal

• Main Authors: Kuan-hung Chen, 陳冠宏
• Other Authors: 彭維鋒
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/38yre7

碩士 === 淡江大學 === 物理學系碩士班 === 106 === Here we report the temperature dependence of anisotropic electronic and magnetic structures of Ni3TeO6 single crystalline samples by means of dichroic XAS techniques. Magnetic measurements have revealed an existence of weak Ni-Ni FM interaction near ~ 60 K (TSO) with different peak pointing along the crystallographic c-axis. Below Neel Temperature, TN ~ 52 K, the sample stabilizes in AFM state with the spin axis also parallel to the c-axis. The Ni L3,2-edge XLD plots have revealed contributions both from magnetic interactions (below the spin ordered phase, T ≤ TSO) and temperature independent crystal field effects above TSO. The XLD results show that above TSO, the Ni 3d eg electrons will remain in in-plane 3dx2-y2 orbitals and switches to the out-of-plane 3d3z2-r2 orbitals below TSO. Ni L3,2-edge with H // c along the crystallographic c-axis existence of XMCD spectra. Due to Ni3TeO6 Ni-spin existence, which produce a series of physical phenomena.