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Angle-Resolved Photoemission Spectroscopy on Mixed-Valent Sm1−xYxS
Keiichiro Imura,Tetsuya Hajiri,Masaharu Matsunami,Shin-ichi Kimura,Masaki Kaneko,Takahiro Ito,Yusuke Nishi,Noriaki K. Sato,Hiroyuki S. Suzuki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report the results of angle-resolved photoemission spectroscopy (ARPES) on the Sm1−xYxSsystem, which exhibits a black-to-golden phase transition induced by yttrium substitution and by anapplied external pressure, in order to investigate the mechanism of this transition and the electronicstructure of both phases. The obtained ARPES spectrum of pure SmS (x = 0) indicates a bandinsulator, in which the shallowest electronic state is the Sm2+ 4f state at a binding energy of about0.4 eV. With increasing x, the top of the Sm2+ 4f band shifts to the lower binding energy side andtouches the Fermi level for x = 0.33. Because of the discontinuous reduction of the lattice constantin the vicinity of the black-to-golden phase transition (x 0.17), the golden phase induced byyttrium substitution is concluded to be an intermediate valence state.
Thermoelectric Power of Mixed-valence Golden-SmS under Pressure
Keiichiro Imura,Yuki Ikeo,Kazushi Sakamoto,Shinjirou Yokota,Noriaki K. Sato 한국물리학회 2023 새물리 Vol.73 No.12
The Seebeck coefficient is a useful physical quantity for identifying novel quantum states in strongly correlated materials. In this study, we performed Seebeck coefficient measurement of high-pressure mixed-valence phase of samarium monosulfide (golden-SmS).We observed Fermi-liquid behavior just after entering the high-pressure phase and in the antiferromagnetically ordered metallic phase. In the temperature derivative of the Seebeck coefficient, a peak structure corresponding to a low-temperature resistivity anomaly was also detected.