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Agrestini, S.,Kuo, C.-Y.,Moretti Sala, M.,Hu, Z.,Kasinathan, D.,Ko, K.-T.,Glatzel, P.,Rossi, M.,Cafun, J.-D.,Kvashnina, K. O.,Matsumoto, A.,Takayama, T.,Takagi, H.,Tjeng, L. H.,Haverkort, M. W. American Physical Society 2017 Physical review. B Vol.95 No.20
<P>We have investigated the electronic structure of Sr2IrO4 using core-to-core resonant inelastic x-ray scattering. The experimental spectra can be well reproduced using ab initio density functional theory based multiplet ligand field theory calculations, thereby validating these calculations. We found that the low-energy, effective Ir t(2g) orbitals are practically degenerate in their crystal-field energy. We uncovered that Sr2IrO4 and iridates in general are negative charge transfer systems with large covalency and a substantial oxygen ligand hole character in the Ir t(2g) Wannier orbitals. This has far reaching consequences, as not only the on-site crystal-field energies are determined by the long-range crystal structure, but, more significantly, magnetic exchange interactions will have long-range distance dependent anisotropies in the spin direction. These findings set constraints and show pathways for the design of d(5) materials that can host compasslike magnetic interactions.</P>
( T. Ide ),( A. Takayama ) 세종대학교 경제통합연구소 1989 Journal of Economic Integration Vol.4 No.2
This paper shows that the shapes of average cost and marginal cost curves and the possibility of scale economies can be quite sensitive to factor price configuration. We illustrate our analysis in terms of "international competitiveness,"
Factor Prices and the Shape of Average Cost Curves with Special References To International Trade
Ide, T.,Takayama, A. 세종대학교 국제경제연구소 1989 Journal of Economic Integration Vol.4 No.2
This paper shows that the shapes of average cost and marginal cost curves and the possibility of scale economies can be quite sensitive to factor price configuration. We illustrate our analysis in terms of "international competitiveness."