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arXiv 1204.6355cond-mat.str-elcond-mat.mtrl-sci
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CaNi2和CaNi3中的近巡游铁磁性

Nearly itinerant ferromagnetism in CaNi2 and CaNi3

A. Jesche, K. W. Dennis, A. Kreyssig, P. C. Canfield

摘要:

CaNi 2和CaNi 3的单晶体成功地从过量的Ca中生长出来。这两种化合物表现出金属基态与增强,温度依赖的磁化率。CaNi2和CaNi3分别具有较高的Stoner因子Z = 0.79和Z = 0.87,表明它们与铁磁不稳定性非常接近。CaNi 3的磁化率在低温(T < 25 K)下的明显的场依赖性表明强的铁磁涨落。还观察到比热的相应贡献,其温度依赖性为T^3lnT。

英文摘要:

Single crystals of CaNi2 and CaNi3 were successfully grown out of excess Ca. Both compounds manifest a metallic ground state with enhanced, temperature dependent magnetic susceptibility. The relatively high Stoner factors of Z = 0.79 and Z = 0.87 found for CaNi2 and CaNi3, respectively, reveal their close vicinity to ferromagnetic instabilities. The pronounced field dependence of the magnetic susceptibility of CaNi3 at low temperatures (T < 25 K) suggests strong ferromagnetic fluctuations. A corresponding contribution to the specific heat with a temperature dependence of T^3lnT was also observed.

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