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JAEA Reports

Abstracts of the Workshop on Orbital Ordering and Fluctuations in d- and f-electron Systems; March 4-6, 2002, ASRC, JAERI, Tokai, Japan

Ueda, Kazuo; Hotta, Takashi

JAERI-Review 2002-037, 31 Pages, 2002/12

JAERI-Review-2002-037.pdf:2.7MB

Strongly correlated f- and d-electron systems including heavy Fermion systems and transition metal oxides are important source of exciting new phenomena in condensed matter physics. Recently it has been recognized in more profound way that the orbital degeneracy of the f- and d-electrons plays very important role underlying those exotic phenomena. The idea of the present workshop is to bring active researchers in the field together and to exchange ideas in informal atmosphere. In the workshop many interesting results were presented and stimulating discussions were made as clearly seen by the present report.

Journal Articles

Prediction of orbital ordering in single-layered ruthenates

Hotta, Takashi; Dagotto, E.*

Physical Review Letters, 88(1), p.017201_1 - 017201_4, 2002/01

https://doi.org/10.1103/PhysRevLett.88.017201

Times Cited Count：81 Percentile：89.84(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 $d_{rm xy}$ orbital, while the $d_{rm yz}$ and $d_{rm zx}$ orbitals contain 1.5 holes. This unexpected $t_{rm 2g}$ 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.