Open AccessStructure, magnetism, and transport properties for Ca doping in Sr2IrO4
Author(s) -
Guotai Zhou,
Xiaomin Gu,
Xingming Yang,
Xiaoyang Gao,
Kang Wang,
Jin Peng,
Fengming Zhang,
X. S. Wu
Publication year - 2017
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4976736
Subject(s) - rietveld refinement , valence (chemistry) , electrical resistivity and conductivity , magnetism , variable range hopping , materials science , arrhenius equation , bond length , atmospheric temperature range , analytical chemistry (journal) , condensed matter physics , doping , magnetic moment , quenching (fluorescence) , lattice constant , chemistry , diffraction , crystallography , crystal structure , thermodynamics , activation energy , physics , optics , organic chemistry , chromatography , quantum mechanics , optoelectronics , fluorescence
An immediate quenching using liquid N2 is applied for synthesizing the 5d transition-metal oxides (Sr1-xCax)2IrO4 (0 ≤ x ≤ 0.15) single phase. X-ray diffraction together with Rietveld refinement shows that the lattice parameters along a and c directions and the bond angle of Ir-O2-Ir decrease with the increase of Ca content. X-ray Absorption Fine Spectroscopy measurements prove that the valence of Ir and the average Ir-O bond-length substantially remain unchanged with Ca content increasing in the phase. The effective magnetic moment μeff and Néel temperature TN decrease simultaneously with increased Ca content. Electrical resistivity shows complex temperature dependence behavior, which follows the three-dimensional variable range hopping behavior at low temperature, Arrhenius-type behavior at middle-temperature, and a weak electronic localization in quasi-two-dimensional at high temperature
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