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Pressure Tuning of Collapse of Helimagnetic Structure in Au2Mn



I Lin NMN Liu, Maria J. Pascale, Juscelino Leao, Craig Brown, William D. Ratcliff, Qingzhen Huang, Nicholas Butch


We identify the phase boundary between spiral spin and ferromagnetic phases in Au2Mn at a critical pressure of 16.4 kbar, as determined by neutron diffraction, magnetization and magnetoresistance measurements. The temperature-dependent critical field at a given pressure is accompanied by a peak in magnetoresistance and a step in magnetization. The critical field decreases and transition width narrows with increasing temperature and pressure. The critical pressure separating the spiral phase and ferromagnetism coincides with disappearance of the magnetroresistance peak, where the critical field goes to zero. The notable absence of an anomalous Hall effect in the ferromagnetic phase is attributable to the high conductivity of this material.
Physical Review B


helimagnet, pressure, quantum critical point


Liu, I. , Pascale, M. , Leao, J. , Brown, C. , Ratcliff, W. , Huang, Q. and Butch, N. (2017), Pressure Tuning of Collapse of Helimagnetic Structure in Au<sub>2</sub>Mn, Physical Review B, [online], (Accessed June 18, 2024)


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Created November 26, 2017, Updated October 12, 2021