Electrical resistivity measurements of single crystalline -Mn under high pressure

Abstract We have measured electrical resistivity of single crystalline α -manganese ( α -Mn) under high pressure. α -Mn shows an antiferromagnetic ordering at T N = 95 K and has four inequivalent crystal sites with different magnetic moments. With increasing pressure, T N shifts toward lower temperature. At higher pressure, the shape of anomaly at T 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 α -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.