Takuya Iizuka

Electronic-Structure-Driven Magnetic Ordering in a Kondo Semiconductor CeOs2Al10

We report the anisotropic changes in the electronic structure of a Kondo semiconductor CeOs(2)Al(10) across an anomalous antiferromagnetic ordering temperature (T(0)) of 29 K, using optical conductivity spectra. The spectra along the a and c axes indicate that an energy gap due to the hybridization between conduction bands and nearly local 4f states, namely the c-f hybridization gap, emerges from a higher temperature continuously across T(0). Along the b axis, on the other hand, another energy gap with a peak at 20 meV becomes visible at 39 K (>T(0)) and fully opens at T(0) because of a charge instability. This result implies that the appearance of the energy gap, as well as the change in the electronic structure along the b axis, induces the antiferromagnetic ordering below T(0).

Optical study of charge instability in CeRu2Al10 in comparison with CeOs2Al10 and CeFe2Al10

The anisotropic electronic structure responsible for the antiferromagnetic transition in CeRu

Existence of Heavy Fermions in the Antiferromagnetic Phase of CeIn3

{}_{2}

Origin of Middle-Infrared Peaks in Cerium Compounds

Al

Anisotropic optical conductivity of the putative Kondo insulator CeRu4Sn6

{}_{10}

Optical Study of Archetypical Valence-Fluctuating Eu Systems

at the unusually high temperature of

Electronic inhomogeneity EuO: Possibility of magnetic polaron states

{T}_{0}=28

Optical properties of the iron-based superconductor LiFeAs single crystal

K was studied using optical conductivity spectra, Ce

Temperature- and Magnetic-Field-Dependent Optical Properties of Heavy Quasiparticles in YbIr2Si2.

3d

Far-infrared optical conductivity of CeCu2Si2

x-ray photoemission spectra, and band calculation. It was found that the electronic structure in the