Quantum phase transition and magneto-transport properties in a chiral helimagnet FeGe under high pressure

B20-type FeGe with a chiral crystal structure has been intensively studied as a near-room temperature skyrmion/helical magnet while an isostructural FeSi has attracted great attention as a narrow gap semiconductor with strong electron correlation effect. In this study, we report high-pressure magneto-transport properties in FeGe measured by using diamond anvil cell. The expected metal-insulator transition was not observed up to 30 GPa although the effective lattice constant should have reached that of FeSi at ~25 GPa. In the meanwhile, the quantum phase transition upon the suppression of long-range magnetic order was identified around the critical pressure of ~19 GPa, showing a non-Fermi liquid behavior in the electrical resistivity. Furthermore, various types of negative/positive magnetoresistance were observed, which indicates the presence of complex magnetic and electronic states in the high-pressure regime above the quantum phase transition. The result of Hall resistivity measurement will also be discussed in light of the topological non-Fermi liquid state which has been reported in the pressurized MnSi.