Research of new functional compounds in layered structure with two-dimensional electronic systems

在含镍钴层的层状化合物中，LnCoAsO （Ln：类镧）表现出流动的电子铁磁性。层内距离大2倍的Sr2ScO3CoAs也表现出铁磁性，表明尽管层内距离有多远，但在层状化合物中仍能实现电子的流动铁磁性。LnCoAsO发生铁磁-反铁磁转变，但其机制尚未明确。在我的研究中，发现Sr2(Sc，V)O3CoAs表现出铁磁-反铁磁转变。这一事实表明，这种转变发生在局域磁矩被流动的电子铁磁层夹在中间的条件下。

Among layered compounds with cobalt pnictogen layers, LnCoAsO (Ln: lanthanoids) shows itinerant electronic ferromagnetism. Sr2ScO3CoAs, which has 2 times larger intra-layer distance, also shows ferromagnetism, showing that itinerant electronic ferromagnetism realizes in layered compounds despite of the intra-layer distance.Ferromagnetic-antiferromagnetic transition occurs in LnCoAsO, but its mechanism has been still unresolved. In my study, Sr2(Sc,V)O3CoAs has been found to show ferromagnetic-antiferromagnetic transition. This fact shows that such transition occurs in a condition that localized magnetic moments are sandwiched by itinerant electronic ferromagnetic layers.