Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators

Article

关键词: REALIZATION;    RELAXATION;    MUONS;    PHOTOEMISSION;    CD1-XMNXTE;    TRANSPORT;    BEAMLINE;    ROTATION;    ADRESS;    BI2TE3;   

DOI  :  10.1103/PhysRevB.96.184402

来源: SCIE

【 摘 要 】

We combine low energy muon spin rotation (LE-mu SR) and soft-x-ray angle-resolved photoemission spectroscopy (SX-ARPES) to study the magnetic and electronic properties of magnetically doped topological insulators, (Bi, Sb)(2)Te-3. We find that one achieves a full magnetic volume fraction in samples of (V/Cr)(x)(Bi, Sb)(2-x)Te-3 at doping levels x greater than or similar to 0.16. The observed magnetic transition is not sharp in temperature indicating a gradual magnetic ordering. We find that the evolution of magnetic ordering is consistent with formation of ferromagnetic islands which increase in number and/or volume with decreasing temperature. Resonant ARPES at the V L-3 edge reveals a nondispersing impurity band close to the Fermi level as well as V weight integrated into the host band structure. Calculations within the coherent potential approximation of the V contribution to the spectral function confirm that this impurity band is caused by V in substitutional sites. The implications of our results on the observation of the quantum anomalous Hall effect at mK temperatures are discussed.

【 授权许可】

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