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January 2009 arXiv papers — page 50

Showing 4,901–4,902 of 4,902 papers

  1. Impact of octahedral rotations on Ruddlesden-Popper phases of antiferrodistortive perovskites

    cond-mat.mtrl-sci

    Daniel A. Freedman, T. A. Arias

    This work presents the most detailed and extensive theoretical study to date of the structural configurations of Ruddlesden-Popper (RP) phases in antiferrodistortive (AFD) perovskites and formulates a program of study which can be pursued for RP phases of any AFD perovskite system. We systematically investigate the effects of oxygen octahedral rotations on t

  2. Galois-Type Extensions and Equivariant Projectivity

    math.QA

    Tomasz Brzezinski, Piotr M. Hajac

    The theory of general Galois-type extensions is presented, including the interrelations between coalgebra extensions and algebra (co)extensions, properties of corresponding (co)translation maps, and rudiments of entwinings and factorisations. To achieve broad perspective, this theory is placed in the context of far reaching generalisations of the Galois cond