arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1406.4522cond-mat.mtrl-sci
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i- $R$ -Cd二十面体准晶($R$ = Y,Gd-Tm)的磁性和输运性质

Magnetic and transport properties of i-$R$-Cd icosahedral quasicrystals ($R$ = Y, Gd-Tm)

Tai Kong, Sergey L. Bud'ko, Anton Jesche, John McArthur, Andreas Kreyssig, Alan I. Goldman, Paul C. Canfield

摘要:

本文采用X射线衍射、变温直流和交流磁化强度、变温电阻和变温比热测量等方法对新近发现的i- $R$ -Cd($R$ = Y,Gd-Tm)二元准晶进行了详细的表征。在结构上,发现i- $R$ -Cd的X射线衍射峰的加宽由冻结相子应变主导,其基本上与$R$无关。i-Y-Cd是弱抗磁性的,并且表现出与温度无关的磁化率。i-Gd-Cd在4.6K以下表现为自旋玻璃,具有直流磁化尖点、三阶非线性磁化率峰、频率依赖的凝固温度和宽的比热最大值。i- $R$ -Cd($R$ = Ho-Tm)在热力学测量中观察到的特征方面类似于i-Gd-Cd。i-Tb-Cd和i-Dy-Cd在它们的零场冷却直流磁化数据中没有显示出明显的尖点,而是显示出更圆的、宽的局部最大值。$R$ -Cd的电阻率为300 $μΩ$ cm数量级,并且与温度关系很弱. i- $R$ -Cd($R$ = Gd-Tm)的特征冻结温度偏离de Gennes标度,其方式与晶体电场分裂诱导的局部矩各向异性一致。

英文摘要:

We present a detailed characterization of the recently discovered i-$R$-Cd ($R$ = Y, Gd-Tm) binary quasicrystals by means of x-ray diffraction, temperature-dependent dc and ac magnetization, temperature-dependent resistance and temperature-dependent specific heat measurements. Structurally, the broadening of x-ray diffraction peaks found for i-$R$-Cd is dominated by frozen-in phason strain, which is essentially independent of $R$. i-Y-Cd is weakly diamagnetic and manifests a temperature-independent susceptibility. i-Gd-Cd can be characterized as a spin-glass below 4.6 K via dc magnetization cusp, a third order non-linear magnetic susceptibility peak, a frequency-dependent freezing temperature and a broad maximum in the specific heat. i-$R$-Cd ($R$ = Ho-Tm) is similar to i-Gd-Cd in terms of features observed in thermodynamic measurements. i-Tb-Cd and i-Dy-Cd do not show a clear cusp in their zero-field-cooled dc magnetization data, but instead show a more rounded, broad local maximum. The resistivity for i-$R$-Cd is of order 300 $μΩ$ cm and weakly temperature-dependent. The characteristic freezing temperatures for i-$R$-Cd ($R$ = Gd-Tm) deviate from the de Gennes scaling, in a manner consistent with crystal electric field splitting induced local moment anisotropy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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