Effect of Hund's rule coupling on SU(4) spin-orbital system

Onishi, Hiroaki ; Hotta, Takashi

By using a density-matrix renormalization group method, we analyze a one-dimensional spin-orbital model, which is derived from an SU(4) symmetric Hubbard model perturbed by the Hund's rule coupling . At =0, both spin and orbital correlations have a peak at =/2 in the ground state due to the SU(4) singlet state with a four-site periodicity. On the other hand, for large values of the Hund's rule coupling, it is found that the peak position of orbital correlation changes to =, while that of spin correlation remains at =/2.

Language	:	English
Journal	:	Journal of Magnetism and Magnetic Materials
Volume	:	310
Number	:	2, Part1
Pages	:	p.790 - 792
Publication Year/Month	:	2007/03
Meeting title	:	17th International Conference on Magnetism (ICM 2006)
Held date	:	2006/08
Location (city)	:	Kyoto
Location (country)	:	Japan
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Registration No. : BB20061226
JAEA Abstracts No. : 35001020
Paper Submission No. : 2579

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