Hybridization between the ligand &lt;em&gt;p&lt;/em&gt; band and Fe-3&lt;em&gt;d&lt;/em&gt; orbitals in the p-type ferromagnetic semiconductor (Ga,Fe)Sb

Takeda, Takahito; Suzuki, Masahiro; Anh, Le Duc; Tu, Nguyen Thanh; Schmitt, Thorsten; Yoshida, Satoshi; Sakano, Masato; Ishizaka, Kyoko; Takeda, Yukiharu; Fijimori, Shin-ichi; Seki, Munetoshi; Tabata, Hitoshi; Fujimori, Atsushi; Strocov, Vladimir N.; Tanaka, Masaaki; Kobayashi, Masaki

doi:10.1103/PhysRevB.101.155142

Hybridization between the ligand p band and Fe-3d orbitals in the p-type ferromagnetic semiconductor (Ga,Fe)Sb

Takeda T, Suzuki M, Anh LD, Tu NT, Schmitt T, Yoshida S, Sakano M, Ishizaka K, Takeda Y, Fijimori S-ichi, Seki M, Tabata H, Fujimori A, Strocov VN, Tanaka M & Kobayashi M

Citation

Takeda, T., Suzuki, M., Anh, L. D., Tu, N. T., Schmitt, T., Yoshida, S., … Kobayashi, M. (2020). Hybridization between the ligand p band and Fe-3d orbitals in the p-type ferromagnetic semiconductor (Ga,Fe)Sb. Physical Review B, 101(15), 155142 (7 pp.). https://doi.org/10.1103/PhysRevB.101.155142

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:32476

(Ga,Fe)Sb is a promising ferromagnetic semiconductor for practical spintronic device applications because its Curie temperature (T_C) is above room temperature. However, the origin of ferromagnetism with high T_C remains to be elucidated. Here, we use soft x-ray angle-resolved photoemission spectroscopy (SX-ARPES) to investigate the valence-band (VB) structure of (Ga_0.95,Fe_0.05)Sb including the Fe-3d impurity band (IB), to unveil the mechanism of ferromagnetism in (Ga,Fe)Sb. We find that the VB dispersion in (Ga_0.95,Fe_0.05)Sb observed by SX-ARPES is similar to that of GaSb, indicating that the doped Fe atoms hardly affect the band dispersion. The Fe-3d resonant ARPES spectra demonstrate that the Fe-3d IB crosses the Fermi level (E_F) and hybridizes with the VB of GaSb. These observations indicate that the VB structure of (Ga_0.95,Fe_0.05)Sb is consistent with that of the IB model which is based on double-exchange interaction between the localized 3d electrons of the magnetic impurities.