Abstract
Local Hall probe array magnetization measurements have been made on single crystals of the magnetic superconductor ${\mathrm{HoNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$. Measured flux profiles show that surface barriers dominate the hysteresis below ${T}_{c}(\ensuremath{\simeq}8.9K)$ except in a narrow temperature range between 5 and 5.75 K where superconductivity is strongly suppressed due to the onset of an $a$-axis incommensurate ordering of the Ho moments. The data presented show that the magnetic order also has a profound influence on the nonequilibrium (vortex-pinning) properties of the superconducting state.
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