Abstract
In order to investigate the interactions between lattice properties, magnetic ordering and superconductivity of DyNi 2B 2C, thermal expansion, magnetostriction and magnetization measurements were performed for T=2–15 K and for μ 0 H=0–3 T on a single crystal in the crystallographic [1 1 0] direction. A magnetic phase diagram is derived that shows two phases (AF1 and AF2) in the narrow region between the zero-field antiferromagnetic AF and the induced ferromagnetic state FM. Moreover, it is characterized by a large-field hysteresis. This behaviour can be described by a two domain magnetic state. The metamagnetic structure AF1 with about a quarter of the saturated magnetization is responsible for suppressing the superconductivity in DyNi 2B 2C because of its ferromagnetic component.
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