Abstract
We investigated the magnetic structure of Ho x Y 1− x Ni 2B 2C for x = 1, 0.85 and 0.75 by means of neutron diffraction as a function of temperature between 1.5 and 10 K in zero external field. We observed several magnetic phases, one with commensurate wave vector (0 0 1) and two with incommensurate wave vectors (0 0 0.915) and (0.585 0 0). Only the temperature dependence of the a-axis modulated structure coincides with the reentrant behavior found for the investigated samples by resistance measurements. This strongly suggests that the a-axis structure is responsible for pair breaking, while both the magnetic structures with c-axis wave vectors do not destroy superconductivity.
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