General Theory of Superexchange Interaction

Theory of anisotropic superexchange in insulating cuprates.

Spin-orbit corrections to superexchange are calculated using the method of Moriya [T. Moriya, Phys. Rev. 120 91, (1960)] for two of the insulating parent compounds of the cuprate superconductors: (1) La2−xNdxCuO4 where the CuO6 octahedra forming each Cu-O layer are tilted in staggered fashion about an axis which depends on x and temperature; and (2) YBa2Cu3O6+x (x ∼ 0.4) where the Cu-O layers f...

General Theory of Interaction and Cognitive Architectures

The challenge of creating a real-life computational equivalent of the human mind is now attracting the attention of many scientific groups from different areas of cybernetics and Artificial Intelligence such as computational neuroscience, cognitive science, biologically inspired cognitive architectures etc. The paper presents a new cognitive architecture based on insertion modeling, one of the ...

Theory of interedge superexchange in zigzag edge magnetism.

A graphene nanoribbon with zigzag edges has a gapped magnetic ground state with an antiferromagnetic interedge superexchange interaction. We present a theory based on asymptotic properties of the Dirac-model ribbon wave function which predicts W-2 and W-1 ribbon-width dependencies for the superexchange interaction strength and the charge gap, respectively. We find that, unlike the case of conve...

Lecture note on solid state physics Superexchange interaction

In preparing this note, we have examined many textbooks of magnetism where the mechanism of the superexchange interaction is discussed. We realize that it may be difficult for readers (in particular graduate students and undergraduate students studying on the magnetism) to understand the physics on the superexchange interactions from these textbooks, partly because of the limited space of the t...

Magnetic Ordering in Gd Monopnictides: Indirect Exchange Versus Superexchange Interaction