Crystal structure and electrical transport properties of single layered perovskite LaSrCoO4

International Conference on Recent Trends in Physics 2016

Ahad, Abdul^1 ; Shukla, D.K.^2 ; Rahman, F.^1 ; Majid, S.^1 ; Tarachand^2 ; Okram, G.S.^2 ; Phase, D.M.^2

Department of Physics, Aligarh Muslim University, Aligarh

202002, India^1

UGC-DAE Consortium for Scientific Research, Indore

452001, India^2

关键词: Electrical transport properties;    K2NiF4-type structure;    Low temperature regions;    Solid state reaction route;    Temperature dependent;    Tetragonal structure;    Thermally activated behaviour;    Variable range hopping model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/755/1/012026/pdf
DOI  :  10.1088/1742-6596/755/1/012026

来源: IOP

【 摘 要 】

We present here investigations on the influence of structure on electrical transport properties of polycrystalline LaSrCoO4that is single layered perovskite with K2NiF4type structure synthesized using solid state reaction route. Using Reitveld refinement of X-ray diffraction (XRD) data, it is found that the sample is in single phase with tetragonal structure (space group I4/mmm). Electrical resistivity performed in the temperature range 140-300K shows semiconducting character of the sample. Considerable contrasts in the Co-O bond length is associated with the intermediate spin (IS) state of Co ion that correlates the structural and transport properties. Detailed analysis indicates that the temperature dependent electrical resistivity follows the three-dimensional variable range hopping (VRH) model in low temperature region below 225K. The high temperature (225-300K) resistivity data has been found to follow the thermally activated behaviour.