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Suppression of spin frustration due to orbital selection

Hiroaki Onishi and Takashi Hotta
Phys. Rev. B 71, 180410(R) – Published 27 May 2005

Abstract

In order to clarify a crucial role of orbital degree of freedom in geometrically frustrated systems, we investigate both ground- and excited-state properties of the eg-orbital degenerate Hubbard model on two kinds of lattices, ladder and zigzag chain, by using numerical techniques. In the ladder, spin correlation extends in the whole system, while the zigzag chain is decoupled to a double chain and spin excitation is confined in one side of the double chain due to the selection of a specific orbital. We envision a kind of self-organization phenomenon that the geometrically frustrated multiorbital system is spontaneously reduced to a one-orbital model to suppress the spin frustration.

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  • Received 1 October 2004

DOI:https://doi.org/10.1103/PhysRevB.71.180410

©2005 American Physical Society

Authors & Affiliations

Hiroaki Onishi and Takashi Hotta

  • Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan

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Issue

Vol. 71, Iss. 18 — 1 May 2005

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