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Electrical resistivity measurements of single crystalline $$alpha$$-Mn under high pressure

Miyake, Atsushi*; Kanemasa, Tsunehiro*; Yagi, Ryohei*; Kagayama, Tomoko*; Shimizu, Katsuya*; Haga, Yoshinori ; Onuki, Yoshichika

We have measured electrical resistivity of single crystalline $$alpha$$-manganese ($$alpha$$-Mn) under high pressure. $$alpha$$-Mn shows an antiferromagnetic ordering at $$T_{rm N}$$ = 95 K and has four inequivalent crystal sites with different magnetic moments. With increasing pressure, $$T_{rm N}$$ shifts toward lower temperature. At higher pressure, the shape of anomaly at $$T_{rm N}$$ changes to a kink-like one, which may indicate different magnetic ordering from that at lower pressure. Such a difference between lower and higher pressure regions is considered to be caused by the four inequivalent magnetic moments in $$alpha$$-Mn. At 1.9 GPa, the boundary of the ordered phases, we observe a sudden decrease of the residual resistivity and a peak of the A-coefficient of $$T^2$$-term of the resistivity.

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