Department of Physics, Loughborough University, LE11 3TU Loughborough, United Kingdom.
Sci Rep. 2012;2:890. doi: 10.1038/srep00890. Epub 2012 Nov 27.
Magnetic materials are usually divided into two classes: those with localised magnetic moments, and those with itinerant charge carriers. We present a comprehensive experimental (spectroscopic ellipsomerty) and theoretical study to demonstrate that these two types of magnetism do not only coexist but complement each other in the Kondo-lattice metal, Tb(2)PdSi(3). In this material the itinerant charge carriers interact with large localised magnetic moments of Tb(4f) states, forming complex magnetic lattices at low temperatures, which we associate with self-organisation of magnetic clusters. The formation of magnetic clusters results in low-energy optical spectral weight shifts, which correspond to opening of the pseudogap in the conduction band of the itinerant charge carriers and development of the low- and high-spin intersite electronic transitions. This phenomenon, driven by self-trapping of electrons by magnetic fluctuations, could be common in correlated metals, including besides Kondo-lattice metals, Fe-based and cuprate superconductors.
具有局域磁矩的材料和具有巡游电荷载流子的材料。我们进行了全面的实验（光谱椭圆偏振法）和理论研究，以证明这两种类型的磁性不仅共存，而且在 Kondo 晶格金属 Tb(2)PdSi(3)中相互补充。在这种材料中，巡游电荷载流子与 Tb(4f)态的大局域磁矩相互作用，在低温下形成复杂的磁晶格，我们将其与磁性团簇的自组织相关联。磁性团簇的形成导致低能光学光谱权重的移动，这对应于巡游电荷载流子导带中赝能隙的打开和低自旋和高自旋相间电子跃迁的发展。这种由磁涨落自捕获电子驱动的现象可能在关联金属中很常见，包括 Kondo 晶格金属、Fe 基和铜酸盐超导体。
