From chiral helimagnet to frustrated spin liquid by tuning the Mn concentration in CoxZnyMnz alloys
The solid solution CoxZnyMnz with the beta-Mn structure presents as a model system for studying emergent magnetic states. One end member, Co10Zn10 is a chiral helimagnet that hosts a magnetic field-induced Skyrmion lattice phase. By alloying with increasing amounts of Mn the helical order is suppressed. This eventually leads to beta-Mn as another end member, a famous elemental frustrated spin liquid. Here we request 5 days on D7 to measure the magnetic and structural correlations in Co7Zn7Mn6 and Co6Zn6Mn8 which have a Mn concentration in the vicinity of where long-range helical order becomes entirely suppressed. Neutron powder diffraction on each sample reveal diffuse-like scattering, which is likely due to short-range magnetic correlations, but which may also be structural in origin. Using D7 we plan to study the scattering from both samples using XYZ polarisation analysis which enables the complete separation of magnetic and nonmagnetic diffuse scattering. Using the data we can construct an effective Hamiltonian, and which allows us to quantify the real-space spin correlations in the range of Mn concentration where helical order is suppressed.
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WHITE Jonathan; KARUBE Kosuke; Henrik M. Ronnow and WILDES Andrew. (2018). From chiral helimagnet to frustrated spin liquid by tuning the Mn concentration in CoxZnyMnz alloys. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-855
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