Structural, Magnetization and Spin Wave Analysis in Layered 5d Iridate Sr2IrO4

International Conference on Advances in Materials and Manufacturing Applications 2017

Bhatti, Imtiaz Noor^1 ; Pramanik, A.K.^1

School of Physical Sciences, Jawaharlal Nehru University, New Delhi

110067, India^1

关键词: Antiferromagnetic spin ordering;    Dzyaloshinskii-moriya;    Field-dependent magnetization;    Low-temperature magnetization;    Magnetic behavior;    Octahedral distortion;    Spin-orbit coupling effects;    Weak ferromagnetic phase;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/310/1/012055/pdf
DOI  :  10.1088/1757-899X/310/1/012055

来源: IOP

【 摘 要 】

Magnetic behavior has been studied in 5d layered compound Sr2IrO4. The material shows reasonable spin-orbit coupling effect. A canted type antiferromagnetic spin ordering induced by Dzyaloshinskii-Moriya antisymmetric interaction arising from IrO6octahedral distortion is observed. Our structural analysis shows a rotation of IrO6octahedra by ∼11.3° around c axis which works as precursor for (canted) weak ferromagnetic phase. Temperature dependant magnetization shows transition temperature ∼225 K and field dependent magnetization shows low moment 0.055 μB/f.u. Our spin-wave analysis of low temperature magnetization data shows very high stiffness constant ∼3365 meVÅ2, which is interesting for this low moment spin canting system.