Pressure induced quantum critical point in Mn1-xCoxGe chiral magnet
MnGe chiral magnet shows giant Topological Hall Effect associated with small helical pitch. In MnGe we have observed a pressure induced Quantum Critical Point (QCP) associated with a High Spin- Low Spin transition, quite unique in the B20 family. At ambient pressure, substitution of Mn for Co strongly weakens Mn magnetism and suppresses the chiral order at low Co content (x=0.3). We propose to study the influence of pressure on a Mn1-XCoxGe sample (x=0.11) just above the Co-induced QCP. This experiment will allow us to see if the HS –LS transition is robust under Co substitution, to study the high pressure phase in details, and find the value of second QCP which marks the transition from the LS to a non-magnetic state. It will be an important step in the understanding of this unusual QCP.
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I. MIREBEAU; DEUTSCH Maxime; FERNANDEZ DIAZ Maria Teresa; Thomas C. Hansen and MARTIN Nicolas. (2015). Pressure induced quantum critical point in Mn1-xCoxGe chiral magnet. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2381
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