Pressure-induced Quantum Critical Points in Mn_{1-x}Rh_{x}Ge Chiral Magnet
MnGe belongs to the topical class of so-called B20 chiral magnets, studied for decades in view of their unique magnetic properties. Under ambient conditions, it possesses the largest ordered moment and shortest helical pitch of its family and displays giant topological Hall effect. Recently, a pressure-induced two-step suppression of long-range magnetic order has been evidenced in MnGe. This is clearly at odds with the other members of the B20 family, for which magnetic collapse proceeds from a monotonous decrease of the ordered magnetic moment. It could be shown that this peculiar scenario survives outside of the helimagnetic phase and proves being an essential characteristic of the system in a large parameter range. In order to get a deeper insight into the mechanisms driving such pressure-induced spin transitions, we propose to study the behavior of weakly Rh-doped MnGe (Mn0.8Rh0.2Ge) by neutron powder diffraction under applied pressure. The obtained results will complement our previous studies of pure and Co-doped MnGe and allow building a quantitative model for the pressure-induced spin transitions in MnGe, with relevance to other systems such as invar alloys.
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MARTIN Nicolas; DEUTSCH Maxime; FERNANDEZ DIAZ Maria Teresa; Thomas C. Hansen and I. MIREBEAU. (2016). Pressure-induced Quantum Critical Points in Mn_{1-x}Rh_{x}Ge Chiral Magnet. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2499
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