Journal
PHYSICAL REVIEW B
Volume 80, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.075112
Keywords
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Funding
- KOSEF [R17-2008-033-01000-0]
- KISTI Supercomputing Center
- National Research Foundation of Korea [2008-0060612] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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