抄録
This article reviews our techniques for obtaining information about the electronic structures of materials under high pressure using infrared spectroscopy. In our experiment, high pressure up to 20 GPa is generated by a diamond anvil cell (DAC). To perform a reliable infrared study in the limited sample space of a DAC, synchrotron radiation at SPring-8 is used as a bright infrared source. With our technique, it is possible to perform reflectance studies of a single crystal sample, rather than powder samples, in a DAC both in the mid- and far-infrared ranges, and to obtain the optical functions such as optical conductivity and dielectric function under high pressure. To illustrate the capability of our method, actual results of high-pressure infrared studies on strongly correlated f-electron compounds are discussed.
