Samatham S Shanmukharao, Suresh K G, Ganesan V
Magnetic Materials Laboratory, Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076, Maharashtra, India. Low Temperature Laboratory, UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya Pradesh, India.
J Phys Condens Matter. 2018 Apr 11;30(14):145602. doi: 10.1088/1361-648X/aab0bc. Epub 2018 Feb 20.
We report on the nature of electron correlations in Fe Co Si ([Formula: see text]) using combined results of magnetization, specific heat and transport properties. Doping driven quantum critical point is observed to occur at [Formula: see text]. The magnetically unstable regime is identified to be centered around [Formula: see text] [[Formula: see text]]. The emergence of non-Fermi liquid behaviors in x = 0.8 (near to ferromagnetic quantum critical point) and x = 0.9 (disorder-induced) compositions are discussed on the basis of the power-law dependence of susceptibility [Formula: see text] ([Formula: see text] for x = 0.8 and 0.55 for x = 0.9), specific heat [Formula: see text] ([Formula: see text] for x = 0.8 and 0.9) and resistivity [Formula: see text] ([Formula: see text] for x = 0.8 and 1.38 for x = 0.9). Further, a comprehensive classification of doping dependent physical properties of Fe Co Si is presented in the revisited temperature-composition (T-x) phase diagram.
我们利用磁化强度、比热和输运性质的综合结果，报道了FeCoSi（[化学式：见原文]）中电子关联的性质。观察到掺杂驱动的量子临界点出现在[化学式：见原文]。确定磁不稳定区域以[化学式：见原文] [[化学式：见原文]]为中心。基于磁化率[化学式：见原文]（x = 0.8时为[化学式：见原文]，x = 0.9时为0.55）、比热[化学式：见原文]（x = 0.8和0.9时为[化学式：见原文]）和电阻率[化学式：见原文]（x = 0.8时为[化学式：见原文]，x = 0.9时为1.38）的幂律依赖性，讨论了x = 0.8（接近铁磁量子临界点）和x = 0.9（无序诱导）成分中非费米液体行为的出现。此外，在重新审视的温度 - 成分（T - x）相图中，给出了FeCoSi掺杂依赖物理性质的全面分类。
