Interaction of hydrogen with magnetism in the Y0.4Gd0.6Hx alloy

The magnetic properties of the system Y0.4Gd0.6H(D)(x), in the concentratio n range 0 less than or equal to x less than or equal to 0.25, have been det ermined through electrical resistivity measurements between 1.35 and 300 K. The paramagnetic spin-disorder resistivity rho(m)(0) decreases with increa sing H concentration x, as well as the amplitudes of the antiferromagnetic and ferromagnetic transitions; though the values of the transition temperat ures themselves, T-N = 192 K and T-C = 80 K, are hardly affected by hydroge n. No low-temperature solid solution alpha* phase is formed, in accord with the empirical observation relating its existence to the value of the inter layer turn angle between two basal planes in the prevailing magnetic modula tion along the c axis. The introduced hydrogen precipitates as GdH2, superi mposing an additional magnetic transformation at 3.6 IC and interfering wit h the spin-wave spectrum of the ahoy at low temperatures.