NMR study of B‐2p Fermi‐level density of states in the transition metal diborides

NMR study of B‐2p Fermi‐level density of states in the transition metal diborides
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过渡金属二硼化物中 B-2p 费米能级态密度的 NMR 研究

DOI:
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发表时间:
2005
期刊:
影响因子:
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通讯作者:
W. Lai
W. Lai
中科院分区:
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文献类型:
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作者:
C. Lue;W. Lai

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我们通过测量TiB2、VB2、ZrB2、NbB2、HfB2和TaB2上的11B核磁共振自旋晶格弛豫速率,对AlB2型过渡金属二硼化物进行了系统的研究。对于所有被研究的材料,观察到的B核弛豫主要是由p电子引起的。与理论计算的比较允许实验确定部分B‐2p费米能级态密度(DOS)。此外,TiB2、ZrB2和HfB中提取的B‐2p费米能级DOS值始终小于VB2、NbB2和TaB2。我们将这种趋势与由带结构计算提出的刚性带情景联系起来。(©2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
We 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)