Inter-comparison of electric and magnetic behaviour of superconducting quaternary oxy-pnictide compounds

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Meena, R.S.^1 ; Rao, K.V.R.^2 ; Kishan, Hari^1 ; Awana, V.P.S.^1

QP and A, National Physical Laboratory (CSIR), New Delhi

110012, India^1

Dept. of Physics, University of Rajasthan, Jaipur, Rajasthan

302004, India^2

关键词: Ginzburg-Landau;    Intercomparisons;    Magnetic behaviour;    Magnetic transport;    Partial replacement;    Single-step method;    Upper critical fields;    X-ray techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012153/pdf
DOI  :  10.1088/1757-899X/171/1/012153

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Three different oxy-pnictides 'REFeAsO' compounds are prepared by simple and easy solid state single step method. Structural analysis is carried with the help of the X-ray technique and confirms that the obtained samples are phase pure and crystallized in tetragonal P4/nmm structure. Superconductivity is introduced by partial replacement of oxygen by Fluorine in NdFeAsO0.8F0.2, SmFeAsO0.8F0.2and PrFeAsO0.8F0.2, with highest Tc(48K) in NdFeAsO0.8F0.2. SmFeAsO0.8F0.2compound shows the highest upper critical field (Hc2) ∼ 377 Tesla, estimated using Ginzburg Landau, (GL). Critical current density doesn't change significantly. The measured MR (magneto resistance) for PrFeAsO is 21.5%, whereas it is 16% for SmFeAsO. Here we report in brief an inter-comparison of various properties like electric and magnetic transport, magneto-resistance for these synthesized oxy-pnictide compounds.