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High-field moment polarization in the ferromagnetic superconductor UCoGe

Magnetization and magnetoresistivity measurements have been performed 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 parallel to 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 striking parallel is made between the high field properties of UCoGe and URhGe, where a moment reorientation in a magnetic field parallel to b of 12 T leads to field-induced reentrant superconductivity.

Figure : High magnetic field - temperature phase diagram of UCoGe and URhGe.

Reference:

W. Knafo et al., Physical Review B, 86, 184416 (2012).