Tata Institute of Fundamental Research, Colaba, Mumbai, India.
J Phys Condens Matter. 2012 Jul 4;24(26):266006. doi: 10.1088/0953-8984/24/26/266006. Epub 2012 Jun 12.
We report on the physical properties of the series Ce(1-x)La(x)Ir(2)B(2) (x = 0-0.9), obtained by means of magnetization, heat capacity and electrical resistivity measurements as a function of temperature (down to 0.7 K for the latter two measurements). The Curie temperature of CeIr(2)B(2) (~5 K) is lowered due to La substitution, as expected. However, no quantum critical point or 'non-Fermi liquid' behavior was observed even in the dilute limit of x = 0.9. Interestingly, ferromagnetic ordering persists even for Ce(0.1)La(0.9)Ir(2)B(2), below 0.8 K. Among the Ce systems, CeIr(2)B(2) is one of the compounds in which direct 4f-4f interaction does not appear to play any role in the magnetism, which is controlled by the indirect exchange interaction alone. In this compound, the Kondo effect persists in the ferromagnetic ordered state, as inferred from the entropy data.
我们报告了系列 Ce(1-x)La(x)Ir(2)B(2)（x = 0-0.9）的物理性质，通过磁化、比热和电阻率测量作为温度的函数（对于后两者测量可低至 0.7 K）来获得。CeIr(2)B(2)（约 5 K）的居里温度由于 La 取代而降低，这是预期的。然而，即使在 x = 0.9 的稀极限下，也没有观察到量子临界点或“非费米液体”行为。有趣的是，即使在 Ce(0.1)La(0.9)Ir(2)B(2)中，低于 0.8 K，铁磁有序仍然存在。在 Ce 系统中，CeIr(2)B(2)是其中之一的化合物，其中直接 4f-4f 相互作用似乎在磁体中不起作用，而是仅由间接交换相互作用控制。在这种化合物中，Kondo 效应在铁磁有序状态下持续存在，这可以从熵数据推断出来。
