Abstract
UTGe compounds form α-hydrides with a small H concentration and β-hydrides accommodating up to 2 H atoms/f.u.. Hydrogen absorption has a significant impact on the 5f magnetism.
The Curie temperature-TC of suspected ferromagnetic superconductor UCoGe increases to 50 K. Magnetic susceptibility of spin fluctuator UFeGe increases, but long-range magnetic order is not achieved.
For ferromagnetic URhGe only α-hydride could be obtained, which moderate increase of TC and spontaneous moment. The α-hydride of UCoGe is surprisingly paramagnetic and non-superconducting despite of a small volume expansion (0.25 %).