The low-temperature proton spin–lattice relaxation is analysed for lanthanum hydrides
LaHx
intentionally doped with Gd or Ce. These paramagnetic impurities were also characterized
by static magnetic susceptibility and electron spin resonance measurements. A quantitative
description of the proton relaxation rate maxima, as well as of the electron spin relaxation
data, is presented. These analyses indicate that the density of states at the rare earth site
disappears only for .
Lanthanum hydrides LaH x , 2.0ഛ x ഛ 3.0, are characterized by static magnetic susceptibility analysis and 139 La nuclear magnetic resonance investigations ͑line splittings, linewidth, line shift, and spin lattice relaxation͒. Temperature and composition dependence of all quantities is determined. Chemical shift is larger than the Knight shift for 139 La in the LaH x compounds. The x dependence of the density of states D͑E F ͒ is derived site selectively and separated into s-and d-like contributions.
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