Physical Properties of Novel 4f electrons in ytterbium-based compounds

镱基化合物中新型 4f 电子的物理性质

• 批准号: 23740276
• 负责人: KOYAMA Takehide
• 金额: $ 2.66万
• 依托单位: University of Hyogo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23740276/
• 关键词: イッテルビウム化合物; 重い電子系; NMR; 核磁気共鳴; 強相関電子系; 強相関物性; イッテルビウム化合物; 重い電子系; NMR; 核磁気共鳴; 強相関電子系; 強相関物性

In order to investigate an electronic state in Yb-based compounds with large low-temperature specific heat, we performed NMR measurement in the half-Heusler compound YbPtSb. The characteristics of localized 4f spins were observedat high temperatures. We found that the dynamicalelectronic properties change at around 10 K, which were observed as anomalies in the nuclear spin-lattice relaxation rate and the nuclear spin-spin relaxation rate. However, any anomalies were detected in static properties such as Knight shift and a specific heat. This unusual low-temperature state may be associated with the formation of the small magnetic moment which observed in the magnetically ordered state below 0.4 K.

为了研究具有较大低温特异性热的基于YB的化合物中的电子状态，我们在半赫斯勒化合物YBPTSB中进行了NMR测量。观察到高温的局部4F旋转的特征。我们发现，动力学特性在10 K左右发生变化，在核自旋晶格松弛率和核自旋旋转弛豫率中被视为异常。但是，在静态特性（例如骑士移动和特定热量）中检测到任何异常。这种不寻常的低温状态可能与在0.4 K以下的磁序状态下观察到的小磁矩的形成有关。