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Drastic change in ferromagnetic ground state associated with pressure-induced metal-insulator transition in $$beta$$-US$$_2$$

Tateiwa, Naoyuki   ; Haga, Yoshinori  ; Yamamoto, Etsuji  ; Fisk, Z.

Paramagnetic $$beta$$-US$$_2$$ is a semiconductor with the band gap of 90 K. The applying pressure on $$beta$$-US$$_2$$ induces a weak ferromagnetic state above 0.5 GPa and the phase is understood as "induced moment ferromagnetism". In this study, we have measured the magnetization in $$beta$$-US$$_2$$ across the insulator-metal transition at 5 GPa with a ceramic anvil high pressure cell. The spontaneous magnetic moment is strongly enhanced at the transition pressure from 0.04 to 0.4 $${mu}_{rm B}$$/U. The ferromagnetic state may be stabilized by the larger carrier concentration.

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