We report magnetization and magnetoresistivity measurements on the isostructural ferromagnetic superconductors UCoGe and URhGe in magnetic fields up to 60 T and temperatures from 1.5 to 80 K. At low-temperature, a moment polarization in UCoGe in a field μ0H∥b of around 50 T leads to well-defined anomalies in both magnetization and magnetoresistivity. These anomalies vanish in temperatures higher than 30-40 K, where maxima in the magnetic susceptibility and the field-induced variation of the magnetoresistivity are found. A comparison is made between UCoGe and URhGe, where a moment reorientation in a magnetic field μ0H∥b of 12 T leads to field-induced reentrant superconductivity.
@article{arxiv.1211.1326,
title = {High-field moment polarization in the ferromagnetic superconductor UCoGe},
author = {W. Knafo and T. D. Matsuda and D. Aoki and F. Hardy and G. W. Scheerer and G. Ballon and M. Nardone and A. Zitouni and C. Meingast and J. Flouquet},
journal= {arXiv preprint arXiv:1211.1326},
year = {2012}
}