Charge Dipolar Ordering in Yb Monopnictides

概要

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Long-standing puzzling anomalous properties in Yb tnonopnictides are sttrdied in detail witha novel new idea of paired Jahn-Teller distortion and charge dipolar ordering accompanied bycompatible magnetic dipole orderiuag. The paired distortion occurs at around 50 K, cortarnonly',with an energy splitting of several rued. This is consistent with other systems that show similarpaired Jahn-Teller distortion. Anoraaalovxs specific heat indvxced by level splitting, including thernagnetic singlet grouod state dtre to an antiferrornagnetic pair exchange interaction, is observedas a two-peak structure with the lower peak arrotrnd 5 K in comnaon. A N!el transition at a lowtemperature of around 0.5 K in common is prirnarily a charge dipolar ordering dtre to pair ordering and occurs in competition with the pair singlet state, catnsing 21 weak transition with a srnallordered moment. The above comnaon features are caused by a strong-pair antiferrornagneticexchange interaction with nearly equal strengths.
社団法人日本物理学会の論文
1997-06-15