Spin Glass ground state in Mn${}_{1-x}$Co${}_x$Si

Abstract

We report the discovery of a new spin glass ground state in the transition metal monosilicides with the B20 crystallographic structure. Magnetic, transport, neutron and muon investigation of the solid solution Mn${}_{1-x}$Co${}_x$Si have revealed a new dome in the phase diagram with evidence of antiferromagnetic interactions. For Mn rich compounds, a sharp decrease of the Curie temperature is observed upon Co doping and neutron elastic scattering shows that helimagnetic order of MnSi persists up to $x=0.05$ with a shortening of the helix period. For higher Co ($0.05<x<0.90$) concentrations, the Curie-Weiss temperature changes sign and the system enters a spin glass state upon cooling ($T_g=9$ K for $x_{Co}=0.50$), due to chemical disorder. In this doping range, a minimum appears in the resistivity, attributed to scattering of conduction electron by localized magnetic moments.

References in corpus (2)

• Large Anomalous Hall effect in a silicon-based magnetic semiconductor
• Magnetoresistance From Quantum Interference Effects in Ferromagnets

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• Magnetic states of Ni-Mn-Sn based shape memory alloy: a combined muon spin relaxation and neutron diffraction study
• Emergent spin-glass state in the doped Hund's metal CsFe2As2
• Physical properties of (Mn,Co)Si