Pyrochlore slab構造を持つ反強磁性体Ba2Su2Ga10-xZnCrxO22のESR

概要

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Geometrically frustrated antiferromagnets have attracted the great interest in which they exhibit a unique behavior. They tend to be in unusual ground states such as a spin glass and a spin liquid instead of classical Neel order. In the family of geometrically frustrated antiferromagnets, the kagome lattice in two dimensions and the pyrochlore lattice in three dimensions have attracted special attentions both experimentally and theoretically. Ba2Su2Ga10-xZnCrxO22 is known to be pyrochlore slab antiferromagnets and it exhibits a strong frustration. In order to investigate the magnetic behavior, high field ESR measurements of Ba2Su2Ga10-xZnCrxO22 have been performed in the millimeter wave region at temperatures from 4.2 K to 200 K. The concentration dependence of Cr3+ ions was observed from x=0.1 to X-7.0. For Ba2Su2Ga10-xZnCrxO22 (x=7.0), the pyrochlore slab is fully filled with Cr3+ ions, the line width of the ESR absorption lines increased and the resonance field shifted as the temperature was decreased. These tendencies were suppressed as the Cr3+ concentration was decreased.
福井大学の論文