Magnetic structure of Y1-xNdxMn6Sn6 alloys

We have made magnetization measurements and neutron diffraction experiments on Y1-xNdxMn6Sn6 alloys (0=<x=<0.5) with hp13-type structure. The alloy with x=0.2 shows a hexagonal structure with the lattice constants of a=5.515A and c=8.990A and a helical antiferromagnetic structure with propagation vector q=(0,0,16) under a magnetic field H=0 at 10K. The helical magnetic arrangement is easily destroyed by applied magnetic field, and becomes finally, a simple ferromagnetic arrangement in a field of 5.5T. The alloy with x=0.4 shows a simple ferromagnetic structure even H=0 at 10K. It is likely that the magnetic moments of Mn and Nd atoms are 2.3μB/Mn atom and 3.2μB/Nd atom, lay in the c-plane, and keep a constant values at 10K in the whole composition (0<x=<0.5)