Electronic states in the pressure-induced magnetically ordered phase in SmB6

International Workshop on Itinerant-Electron Magnetism

Mito, Takeshi^1 ; Emi, Naoya^1 ; Kawamura, Naomi^2 ; Mizumaki, Masaichiro^2 ; Koyama, Takehide^1 ; Ueda, Koichi^1 ; Ishimatsu, Naoki^3 ; Iga, Fumitoshi^4

Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo

678-1297, Japan^1

Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo

679-5198, Japan^2

Graduate School of Science, Hiroshima University, Hiroshima

739-8526, Japan^3

Faculty of Science, Ibaraki University, Ibaraki Mito

310-8512, Japan^4

关键词: Critical pressures;    Electronic systems;    High pressure measurements;    Insulator metal transition;    Intermediate valence;    Magnetic transitions;    Temperature increase;    Trivalent state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/868/1/012008/pdf
DOI  :  10.1088/1742-6596/868/1/012008

来源: IOP

【 摘 要 】

We have carried out the high-pressure measurement of X-ray absorption spectroscopy on the intermediate valence compound SmB6which shows magnetic ordering as well as an insulator-metal transition at critical pressure Pc∼ 10 GPa. The valence of Sm atom at room temperature increases with increasing pressure, however it is far below a trivalent state at Pc. In contrast to cases of pressure-induced nonmagnetic-magnetic transition in Yb compounds, which mostly occurs in the scheme of well localized 4f electrons, the present observation suggests that electronic system in SmB6still possesses strong delocalized characters at Pc.