High-field moment polarization in the ferromagnetic superconductor UCoGe

Sunday, December 02, 2012

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.

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