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    NMR Evidence for the Topologically Nontrivial Nature in a Family of Half-Heusler Compounds

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    Type
    Article
    Authors
    Zhang, Xiaoming
    Hou, Zhipeng
    Wang, Yue
    Xu, Guizhou
    Shi, Chenglong
    Liu, EnKe
    Xi, Xuekui
    Wang, Wenhong
    Wu, Guangheng
    Zhang, Xixiang cc
    KAUST Department
    Physical Sciences and Engineering (PSE) Division
    Date
    2016-03-16
    Permanent link to this record
    http://hdl.handle.net/10754/601581
    
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    Abstract
    Spin-orbit coupling (SOC) is expected to partly determine the topologically nontrivial electronic structure of heavy half-Heusler ternary compounds. However, to date, attempts to experimentally observe either the strength of SOC or how it modifies the bulk band structure have been unsuccessful. By using bulk-sensitive nuclear magnetic resonance (NMR) spectroscopy combined with first-principles calculations, we reveal that 209Bi NMR isotropic shifts scale with relativity in terms of the strength of SOC and average atomic numbers, indicating strong relativistic effects on NMR parameters. According to first-principles calculations, we further claim that nuclear magnetic shieldings from relativistic p1/2 states and paramagnetic contributions from low-lying unoccupied p3/2 states are both sensitive to the details of band structures tuned by relativity, which explains why the hidden relativistic effects on band structure can be revealed by 209Bi NMR isotropic shifts in topologically nontrivial half-Heusler compounds. Used in complement to surface-sensitive methods, such as angle resolved photon electron spectroscopy and scanning tunneling spectroscopy, NMR can provide valuable information on bulk electronic states.
    Citation
    NMR Evidence for the Topologically Nontrivial Nature in a Family of Half-Heusler Compounds 2016, 6:23172 Scientific Reports
    Sponsors
    This work was supported by the National Program on Key Basic Research Project (Grant No. 2012CB619405 and 2011CB012800), National Natural Science Foundation of China, NSFC (Grant Nos 51371190, 51301195 and No. 11474343), and Strategic Priority Research Program B of the Chinese Academy of Sciences under the grant No. XDB07010300.
    Publisher
    Nature Publishing Group
    Journal
    Scientific Reports
    ISSN
    2045-2322
    DOI
    10.1038/srep23172
    PubMed ID
    26980406
    Additional Links
    http://www.nature.com/articles/srep23172
    ae974a485f413a2113503eed53cd6c53
    10.1038/srep23172
    Scopus Count
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    Articles; Physical Sciences and Engineering (PSE) Division

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