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Yanase, Yoichi*; Jujo, Takanobu*; Nomura, Takuji; Ikeda, Hiroaki*; Hotta, Takashi; Yamada, Kosaku*
Physics Reports; A Review Section of Physics Letters, 387(1-4), p.1 - 149, 2003/11
Times Cited Count：228 Percentile：83.69(Physics, Multidisciplinary)In this article we review essential natures of superconductivity in strongly correlated electron systems from a universal point of view. Here we consider materials such as high-
cuprates, BEDT-TTF organic superconductors, ruthenate Sr
RuO
, and heavy fermion superconductors. After the review of experimental results, we explain the formalism to discuss superconducting properties of strongly correlated electron systems based on the Dyson-Gor'kov equations. Then, we introduce theoretical retults on cuprates, organics, ruthenate, and heavy fermion superconductors in this order.
Hotta, Takashi; Dagotto, E.*
Physical Review Letters, 88(1), p.017201_1 - 017201_4, 2002/01
Times Cited Count：83 Percentile：89.91(Physics, Multidisciplinary)The key role of the orbital degree of freedom to understand the magnetic properties of layered ruthenates is here discussed. In the G-type antiferromagnetic (AFM) phase of CaRuO, recent X-ray experiments reported the presence of 0.5 hole per site in the 
orbital, while the 
and 
orbitals contain 1.5 holes. This unexpected 
hole distribution is explained by a novel state with orbital ordering (OO), stabilized by a combination of Coulomb interactions and lattice distortions. In addition, the rich phase diagram presented here suggests the possibility of large magnetoresistance effects, and predicts a new ferromagnetic OO phase in ruthenates.
