Electrical resistivity and ac-susceptibility measurements under high pressure were carried out in high-quality single crystals of α-Mn. The pressure-temperature phase diagram consists of an antiferromagnetic ordered phase (0 < P < 1.4 GPa, T < TN), a pressure-induced ordered phase (1.4 < P < 4.2-4.4 GPa, T < TA), and a paramagnetic phase. A significant increase was observed in the temperature dependence of ac-susceptibility at TA, indicating that the pressure-induced ordered phase has a spontaneous magnetic moment. Ferrimagnetic order and parasitic ferromagnetism are proposed as candidates for a possible magnetic structure. At the critical pressure, where the pressure-induced ordered phase disappears, the temperature dependence of the resistivity below 10 K is proportional to T5/3. This non-Fermi liquid behavior suggests the presence of pronounced magnetic fluctuation.
|Publication status||Published - Sep 24 2020|
- Electrical resistivity
- Quantum critical point
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