Structure, magnetism, and transport properties for Ca doping in Sr2IrO4
Guotai Zhou,
Xiaomin Gu,
Xingming Yang,
Xiaoyang Gao,
Kang Wang,
Jin Peng,
Fengming Zhang,
X. S. Wu
Affiliations
Guotai Zhou
Collaborative Innovation Center of Advanced Microstructures, Lab of Solid State Microstructures, Photovoltaic Engineering Center, School of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
Xiaomin Gu
Collaborative Innovation Center of Advanced Microstructures, Lab of Solid State Microstructures, Photovoltaic Engineering Center, School of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
Xingming Yang
Collaborative Innovation Center of Advanced Microstructures, Lab of Solid State Microstructures, Photovoltaic Engineering Center, School of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
Xiaoyang Gao
Collaborative Innovation Center of Advanced Microstructures, Lab of Solid State Microstructures, Photovoltaic Engineering Center, School of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
Kang Wang
Collaborative Innovation Center of Advanced Microstructures, Lab of Solid State Microstructures, Photovoltaic Engineering Center, School of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
Jin Peng
Collaborative Innovation Center of Advanced Microstructures, Lab of Solid State Microstructures, Photovoltaic Engineering Center, School of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
Fengming Zhang
Collaborative Innovation Center of Advanced Microstructures, Lab of Solid State Microstructures, Photovoltaic Engineering Center, School of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
X. S. Wu
Collaborative Innovation Center of Advanced Microstructures, Lab of Solid State Microstructures, Photovoltaic Engineering Center, School of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
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.
