Orbital magnetism: pros and cons for enhancing the cluster magnetism.

Orbital Polarization, Surface Enhancement and Quantum Confinement in Nano-cluster Magnetism

Within a rather general tight-binding framework, we studied the magnetic properties of Nin clusters with n = 9 through 60. In addition to usual hopping, exchange, and spin-orbit coupling terms, our Hamiltonian also included orbital correlation and valence orbital shift of surface atoms. We show that orbital moment not only contributes appreciably to the total moment in this range of cluster siz...

Abstract Submitted for the MAR15 Meeting of The American Physical Society Orbital Nematic Order and Interplay with Magnetism in the Two-Orbital Model for Iron Pnictides ANDRIY NEVIDOMSKYY, ZHEN-

Submitted for the MAR15 Meeting of The American Physical Society Orbital Nematic Order and Interplay with Magnetism in the Two-Orbital Model for Iron Pnictides ANDRIY NEVIDOMSKYY, ZHENTAO WANG, Department of Physics and Astronomy, Rice University — Motivated by recent ARPES measurements on FeSe [1] and LiFeAs [2] families of iron-based superconductors, we have studied the orbital nematic order ...

Anisotropy in Magnetism

The enormous research on magnetic properties of ultrathin films and nanostructures produces also new activities in the fundamental understanding of the magnetic anisotropy energy (MAE) and the anisotropy of the orbital magnetic moment/atom. The pseudomorphic growth of Fe, Co, Ni on metallic and non-metallic substrates can change the nearest neighbor distance by ≈ 0.05 Å. This small change in st...

Pros and Cons of Dancing in the Dark: Enhancing EFL learners' oral proficiency in an unplugged learning community

Recent thrust of research has focused on non-conventional classrooms for teaching to EFL learners. Amongst the newly developed models, Unplugged Classroom Model (UCM) is the most debated one as textbooks are aside and the syllabus is based on conversation-driven activities. This study sought to determine the pros and cons of unplugged teaching for enhancing EFL learners' oral proficiency. From ...

Correlation effects and orbital magnetism of Co clusters