Starting from a spin-orbital model for doped manganites, we investigate a competition between ferromagnetic and antiferromagnetic order in a one-dimensional model at finite temperature. The magnetic and orbital order at half filling support each other and depend on a small antiferromagnetic superexchange between t2g spins and on an alternating Jahn-Teller potential. The crossover to a metallic ...

1 . INTRODUCTION....................................................................................................... 29 2. MODEL SPACES AND EFFECTIVE HAMILTONIANS ......................................................... 32 2.1 Model-Independent Eff ective HamiltoniansThe W Interaction/or sd-Shell Nuclei ........................................... ...............................................

Much work has been done on software reuse “in the small” – objects, subroutines, and components. Relatively little work on very large-grained reuse is available in the literature. Such reuse might include reusing an entire automated teller machine (ATM) software and hardware system for banks across multiple continents; and reusing infrastructure across Internet, teller systems, and ATM systems,...

Mossbauer, EPR, magnetic susceptibility, and DFT studies of the unusual two-coordinate iron(II) amide Fe[N(t-Bu)(2)](2) show that it retains a linear N-Fe-N framework due to the nonbonding delta nature of the (xy, x(2)-y(2)) orbitals. The resulting near-degenerate ground state gives rise to a large magnetic moment and a remarkably large internal hyperfine field. The results confirm that extraor...

The results of calculations on static Jahn-Teller ground state splittings inicosahedral C 60 ðN 1⁄4 1; . . . ; 4Þ fullerene anions with different types of electron-electron interaction are presented. Multielectron states of anions are determined within a quasy-p-electronic model configuration interaction (CI) method for two active spaces of t1u and t1uþ t1g molecular orbitals. Electron–lattice ...

The dynamical Jahn-Teller effect on fullerene sites in insulating Cs(3)C(60) is investigated fully ab initio. The vibronic excitations of rotational type are at ≥ 65 cm(-1), while the net kinetic contribution to the Jahn-Teller stabilization energy constitutes approximately 90 meV. This means that no localization of distortions by intermolecular interactions is possible in these fullerides; the...

Photon-added Gazeau-Klauder and Klauder-Perelomov coherent states are investigated. Application to Pöschl-Teller potentials is given.