Study on strongly correlated ternary transition metal nitride synthesized by H2-N2 gas method.

本文对Fe_3Mo_3N和（Fe_（1-x）Co_x）_3Mo_3N体系的物理性质进行了较全面的研究。在这项研究中，非费米液体行为没有任何调整，如物理压力和/或化学掺杂被发现的第一次。NFL行为表明纯Fe_3Mo_3N附近存在量子临界点。场和替代诱导的铁磁相被发现是预期的。所构建的相图并不平凡，表明η-碳化物型化合物中固有的几何挫折效应。用热等静压法首次合成了铁磁体Fe_3W_3N和反铁磁体Fe_6W_6N。

Physical properties of Fe3Mo3N and(Fe1-xCox)_3Mo_3N systems have been studied comprehensively. In this study, a non-Fermi-liquid behavior without any tuning such as physical pressure and/or chemical doping was found for the first time. NFL behavior suggests the existence of quantum critical point in the vicinity of pure Fe_3Mo_3N. Field and substitution induced ferromagnetic phases were found as was expected. The constructed phase diagram is not trivial, suggesting the effect of geometrical frustration inherent in theη-carbide-type compound. Related compound Fe_3W_3N(a ferromagnet TC=110 K) and Fe_6W_6N(an antiferromagnet TN=75 K) were synthesized by HIP method for the first time.