Forced-ferromagnetic state in a TmFeH single crystal.

We report the attainment of the ferromagnetic state in an interstitially modified heavy rare-earth-iron intermetallic compound in an external magnetic field. The starting composition is REFe, which is the RE-Fe binary richest in iron. We concentrate on the Tm-Fe compound, which is the most sensitive to magnetic field.

Magnetic and structural properties of Lu(2)(Fe, Mn)(17)H(y) hydrides.

The Lu(2)Fe(17-x)Mn(x)H(y), x = 0-2, y = 0-3, hydrides with the Th(2)Ni(17)-type crystal structure were prepared and their structural and magnetic parameters were studied. The lattice parameters measured at room temperature increase smoothly with H content. The magnetic measurements indicate that the Lu(2)Fe(17)H(y) hydrides (with y up to 1.