Spin-glass ground state in Mn&lt;sub&gt;1-&lt;em&gt;x&lt;/em&gt;&lt;/sub&gt;Co&lt;sub&gt;&lt;em&gt;x&lt;/em&gt;&lt;/sub&gt;Si

Teyssier, J.; Giannini, E.; Guritanu, V.; Viennois, R.; van der Marel, D.; Amato, A.; Gvasaliya, S.N.

doi:10.1103/PhysRevB.82.064417

Spin-glass ground state in Mn_1-xCo_xSi

Teyssier J, Giannini E, Guritanu V, Viennois R, van der Marel D, Amato A & Gvasaliya SN

Citation

Teyssier, J., Giannini, E., Guritanu, V., Viennois, R., van der Marel, D., Amato, A., & Gvasaliya, S. N. (2010). Spin-glass ground state in Mn_1-xCo_xSi. Physical Review B, 82(6), 064417 (7 pp.). https://doi.org/10.1103/PhysRevB.82.064417

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:15615

We report the discovery of a spin-glass ground state in the transition-metal monosilicides with the B20 crystallographic structure. Magnetic, transport, neutron, and muon investigations of the solid solution Mn_1−xCo_xSi have revealed a new dome in the phase diagram with evidence of antiferromagnetic interactions. For Mn-rich compounds, a sharp decrease in 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.