Abstract
The nuclear spin-lattice relaxation times T 1 of vanadium were measured in several stochiometric and non-stochiometric V-based A15 compounds (V x Pt 1− x and V x Ir 1− x system, V 50Os 50, V 77Ni 23, V 3Rh, V 3Pd, V 3Co) . The relaxation rates R = 1/ T 1 T at T ≈ 0 were compared with known values of the electronic specific heat γ in order to relate them to the “bare density of states” of the conduction electrons at the Fermi level. As a result it was found that the contribution of the s electrons to the total relaxation rate R can be neglected. R is predominantly determined by the d electron orbital relaxation rate R orb d which is caused by the fact that only the σ z and π z d sub-bands contribute significantly to the total density of state of the d electrons at the Fermi level. From the relaxation measurements on the Pt nuclei in the V x Pt 1− x system, Ti 3Pt, Nb 3Pt and Cr 79Pt 21 it is concluded that the Pt 5-d electron orbits are strongly admixed with the d electron orbits from the A elements (V, Nb, Ti, Cr) which constitute the linear chains in the A15 structure.
Published Version
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