Abstract
AbstractWe present a systematic study of the AlB2‐type transition metal diborides by measuring the 11B NMR spin‐lattice relaxation rate on TiB2, VB2, ZrB2, NbB2, HfB2, as well as TaB2. For all studied materials, the observed relaxation at B nuclei is mainly due to the p‐electrons. The comparison with theoretical calculations allows the experimental determination of the partial B‐2p Fermi‐level density of states (DOS). In addition, the extracted B‐2p Fermi‐level DOS values in TiB2, ZrB2, and HfB are consistently smaller than in VB2, NbB2, and TaB2. We connect this trend to the rigid‐band scenario raised by band structure calculations. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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