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Possible existence of magnetic polaron in nearly ferromagnetic semiconductor $$beta$$-US$$_2$$

Ikeda, Shugo*; Sakai, Hironori  ; Tateiwa, Naoyuki  ; Matsuda, Tatsuma; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji ; Nakamura, Akio; Shiokawa, Yoshinobu*; Ota, Yuki*; Sugiyama, Kiyohiro*; Hagiwara, Masayuki*; Kindo, Koichi*; Matsubayashi, Kazuyuki*; Hedo, Masato*; Uwatoko, Yoshiya*; Haga, Yoshinori ; Onuki, Yoshichika

We studied the magnetic properties of a paramagnet $$beta$$-US$$_2$$ with the orthorhombic crystal structure by measuring the magnetization, magnetic susceptibility, specific heat and electrical resistivity under magnetic field and pressure. The 5$$f$$-crystalline electric field (CEF) scheme was determined from the experimental results The insulating resistivity is drastically changed to a metallic one under high pressure 8 GPa similar to that of the semimetallic Ising-type ferromagnet UTeS with the Curie temperature $$T_{rm C}$$=87 K. From these experimental results, it was concluded that $$beta$$-US$$_2$$ is in the vicinity of the ferromagnetic ordering at ambient pressure. The anomalous magnetization was analyzed on the basis of the ferromagnetic cluster and discussed from a viewpoint of the magnetic polaron.

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Category:Physics, Multidisciplinary

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