2005/01/20 by M. Matsunami, Masaharu Matsunami, L. Chen +7
Chemistry · Materials Science · Physics and Astronomy · #Band gap #Chemistry #Condensed matter physics #Crystallography #Electrical resistivity and conductivity #Energy (signal processing) #Iron-based superconductors research #Materials science #Optical conductivity #Optical spectra #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Skutterudite #Spectral line #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.72.073105
published as Phys. Rev. B 72, 73105 (2005). · 4pages, 4figures, submitted to Physical Review B
arxiv created 2005/01/20 · openalex publication_date 2005/08/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Electronic structures of the filled-skutterudite compounds PrRu4P12 and SmRu4P12, which undergo a metal-insulator transition (MIT) at TMI=60\phantom\rule0.3em0exK and 16\phantom\rule0.3em0exK, respectively, have been studied by means of optical spectroscopy. Their optical conductivity spectra have clearly revealed an energy gap of \ensuremath∼10\phantom\rule0.3em0exmeV below TMI. The detailed temperature and energy dependences of the energy gap are shown, which give much more information about the gap compared with that from the electrical resistivity experiment. For PrRu4P12, in addition, optical phonon peaks in the spectra show anomalies upon the MIT, including broadening and shifts at TMI and an appearance of new peaks below TMI. These results are discussed in terms of density waves or orbital ordering previously predicted for these compounds.