High resoeution, high energy spectroscopy of electronic states on phase transitions

Fermi水平上的电子状态的变化是通过高分辨率光谱学来研究的。这种共振摄影技术得到了充分的利用。In the former half of the research， the spectral changes of the low car？heavy fermion system Yb D24 y D2As y D23 y D2 and related compounds were studied。高分辨率的照片发射成功地在Kondo绝缘系统YbB中执行了D212。In the case of the Nd-D21-x-D2Sr-D2x-D2MnO-D23-D2， spectral changes through paramagnetic insulator-ferManagement magnetic metal-charge ordered insulator were observed for x=0.5。对于x=0.47，超磁绝缘体-铁磁金属转换被观察到，费米切割被观察到最低的温度。在研究的最后一半，我们在SPring-8上构建和委托世界上性能最好的软X射线束线。在900 eV的Yb系统中，光发射性能显示了表面Yb D12+ YD 1几乎被抑制了。因此，deconvolution总是需要从100 eV附近提取散装Yb D12+ Y D1组件并不需要更多地了解真正的散装电子国家。这种情况对Ce系统来说是更严重的，而deconvolution则是无用的，因为表面和散装组件的重叠。However，我们的散装敏感摄影技术已经找到了提供散装光谱的方法。所以我们找到了这样的Ce 4F规格，它可以通过孔多温度来缩放。这一未经预测的结果发表在《自然和刺激世界上许多科学家》中，平行、结构和磁性是为金属硝酸盐和YCoB系统理论研究的。在非磁性相位中，总能量和磁性时刻被计算得很好。

Changes of electronic states near the Fermi level on phase transitions are extensivelu studied by means of high resolution spectroscopy. The resonance photoemission technique was intensively employed. In the former half of the research, the spectral changes of the low carrier heavy fermion system YbィイD24ィエD2AsィイD23ィエD2 and related compounds were studied. The high reslution photoemission was successfully performed in the Kondo insulator system YbBィイD212ィエD2. In the case of the NdィイD21-xィエD2SrィイD2xィエD2MnOィイD23ィエD2, spectral changes through paramagnetic insulator-ferromagnetic metal-charge ordered insulator were observed for x=0.5. For x=0.47, paramagnetic insulator-ferromagnetic metal transition was observed and the Fermi cut off was observed down to the lowest temperature.In the latter half of the research, we constructed and commissioned the world-best performance soft X-ray beam line at SPring-8. The photoemission performed at 900eV for Yb system has shown that the surface YbィイD12+ィエD1 is almost suppressed. Thus the deconvolution which has been always required to derive the bulk YbィイD12+ィエD1 components from the spectra measured near 100eV is no more necessary to know the genuine bulk electronic states.The situation was more severe for the Ce system, where the deconvolution was useless because of the overlap of surface and bulk components. However, our bulk sensitive photoemision technique is found to provide the bulk spectrum. Thus we have found that the Ce 4f spectra can be scaled by the Kondo temperature. This unprecedented results are published in Nature and stimulating many scientists in the world.In parallel, the structure and magnetism were theoretically studied for taransition metal nitrides and YCoB systems. The lattice constants in the nonmagnetic phase, total energy, as well as magnetic moments were calculated.