Abstract
Measurements of the proton spin-lattice relaxation (SLR) rate in yttrium-hydrogen solid solutions ({alpha}-YH{sub {ital x}}) show that the hydrogen-pairing phenomenon, which occurs in the temperature range 170--300 K, is accompanied by a continuous, strong (22%) decrease in the Korringa parameter, {ital R}{sub 1{ital e}}/{ital T}, with decreasing temperature, where {ital R}{sub 1{ital e}} is the conduction-electron contribution to the total SLR rate. This shows that a substantial (37%) change occurs in the product of the hyperfine field at the proton site and the local {ital d}-band density of states at the Fermi level, {ital N}{sub {ital d}}({ital E}{sub {ital F}}), when hydrogens become paired. Similar behavior has not been detected in the corresponding Sc-H and Lu-H systems in which pairing also occurs.
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