Magnetic structure in Mn1-xCoxGe compounds

Authors:
E. Altynbaev, S.-A.. Siegfried, P. Strauß, D. Menzel, A. Heinemann, L. Fomicheva, A. Tsvyashchenko, S. Grigoriev
The year of the publication:
2018
Journal:
Physical Review B N 14 vol. 97 144411
Keywords:
Exchange interaction, Ferromagnetism, Magnetic phase transitions, Magnetic susceptibility, RKKY interaction, DMI, MnGe
Abstract:

The magnetic system of the pseudobinary compound Mn1−xCoxGe has been studied using small-angle neutron scattering and susceptibility measurements. It is found that Mn1−xCoxGe orders magnetically at low temperatures in the whole concentration range of x∈[0/0.9]. Four different states of the magnetic structure have been found at low temperatures: the long-range-ordered (LRO) short-period helical magnetic structure at x<xc1≈0.25, with helical wave vector ks≃2 nm−1; the short-range-ordered (SRO) short-period helical magnetic structure at xc1≤x≤xc2≈0.45; the long-period helical magnetic structure at xc2<x≤0.8, with helical wave vector ks≪1 nm−1; and the ferromagneticlike structure at x≈0.9.

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