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

doi:10.1063/1.4976736

AIP Advances (May 2017)

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

DOI: https://doi.org/10.1063/1.4976736
Journal volume & issue: Vol. 7, no. 5
pp. 055823 – 055823-6

Abstract

Read online

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.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

About the journal