Magnetic structures and crystal field in the heavy electron materials YbAgGe and YbPtIn
Magnetic structures and crystal field in the heavy electron
materials YbAgGe and YbPtIn
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重电子材料YbAgGe和YbPtIn的磁结构和晶体场
DOI：
10.1140/epjb/e2007-00042-6
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
C. Geibel
中科院分区：
文献类型：
--
作者：
P. Bonville;M. Rams;K. Królas;J. P. Sanchez;P. Canfield;O. Trovarelli;C. Geibel
我们用~（170）Yb穆斯堡尔谱测量了重电子化合物YbAgGe和YbPtIn的磁性质，用扰动角相关（PAC）测量了YbAgGe的晶场性质。在YbAgGe，我们表明，两个磁有序相低于0.8 K涉及一个特定的无公度调制的Yb时刻。对现有低温比热数据的分析表明，相关Yb自旋的波动持续到0.1 K。 PAC的数据允许区分提出的Yb 3+晶体场级计划。在YbPtIn中，我们发现低温磁有序相具有反铁-对位结构，零磁矩Yb离子与大磁矩Yb离子共存，并且在1.4K下发生90°磁矩重取向。
We have examined the magnetic properties of the heavy electron compounds YbAgGe and YbPtIn by170Yb Mössbauer spectroscopy down to 0.1 K, and the crystal field properties of YbAgGe by Perturbed Angular Correlations (PAC) measurements up to 900 K. In YbAgGe, we show that each of the two magnetically ordered phases below 0.8 K involves a specific incommensurate modulation of the Yb moment. An analysis of existing low temperature specific heat data suggests the persistence of fluctuations of the correlated Yb spins down to 0.1 K. The PAC data allow to discriminate among proposed Yb3+crystal field level schemes. In YbPtIn, we show that the low temperature magnetic order phase has an antiferro-para structure, where zero moment Yb ions coexist with large moment ones, and that a 90° moment reorientation occurs at 1.4 K.