Anisotropic exchange interactions of spin-orbit-integrated states in Sr2IrO4
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- Anisotropic exchange interactions of spin-orbit-integrated states in Sr2IrO4
- Jin, Hosub; Jeong, Hogyun; Ozaki, Taisuke; Yu, Jaejun
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW B, v.80, no., pp.075112 -
- We present a microscopic model for the anisotropic exchange interactions in Sr2IrO4. A direct construction of Wannier functions from first-principles calculations proves the j(eff)=1/2 character of the spin-orbit integrated states at the Fermi level. An effective j(eff)-spin Hamiltonian explains the observed weak ferromagnetism and anisotropy of antiferromagnetically ordered magnetic state, which arise naturally from the j(eff)=1/2 state with a rotation of IrO6 octahedra. It is suggested that Sr2IrO4 is a unique class of materials with effective exchange interactions in the spin-orbital Hilbert space.
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