| Autor: |
Suzuki, H., Zhao, K., Shibata, G., Takahashi, Y., Sakamoto, S., Yoshimatsu, K., Chen, B. J., Kumigashira, H., Chang, F. -H., Lin, H. -J., Huang, D. J., Chen, C. T., Gu, Bo, Maekawa, S., Uemura, Y. J., Jin, C. Q., Fujimori, A. |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Physical Review B 91, 140401(R) (2015) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.91.140401 |
| Popis: |
The electronic and magnetic properties of a new diluted magnetic semiconductor (DMS) Ba$_{1-x}$K$_{x}$(Zn$_{1-y}$Mn$_{y}$)$_{2}$As$_{2}$, which is isostructural to so-called 122-type Fe-based superconductors, are investigated by x-ray absorption spectroscopy (XAS) and resonance photoemission spectroscopy (RPES). Mn $L_{2,3}$-edge XAS indicates that the doped Mn atoms have the valence 2+ and strongly hybridize with the $4p$ orbitals of the tetrahedrally coordinating As ligands. The Mn $3d$ partial density of states (PDOS) obtained by RPES shows a peak around 4 eV and relatively high between 0-2 eV below the Fermi level ($E_{F}$) with little contribution at $E_{F}$, similar to that of the archetypal DMS Ga$_{1-x}$Mn$_{x}$As. This energy level creates $d^{5}$ electron configuration with $S=5/2$ local magnetic moments at the Mn atoms. Hole carriers induced by K substitution for Ba atoms go into the top of the As $4p$ valence band and are weakly bound to the Mn local spins. The ferromagnetic correlation between the local spins mediated by the hole carriers induces ferromagnetism in Ba$_{1-x}$K$_{x}$(Zn$_{1-y}$Mn$_{y}$)$_{2}$As$_{2}$ |
| Databáze: |
arXiv |
| Externí odkaz: |
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