Photoemission and X-ray Magnetic Circular Dichroism Study of the New Diluted
Magnetic Semiconductor Ba1-yKy(Zn1-xMnx)2As2
H. Suzuki1, K. Zhao2, G. Shibata1, Y. Takahashi1, S. Sakamoto1, K. Yoshimatsu1,
H. Kumigashira3, A. Fujimori1, F.-H. Chang4, H.-J. Lin4, D. J. Huang4, C. T. Chen4, Bo
Gu5, S. Maekawa5, Y. J. Uemura6, and C. Q. Jin2
1
Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy
of Sciences, Beijing 100190, China
3
KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan
4
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
5
Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
6
Department of Physics, Columbia University, New York, New York 10027, USA
2
Diluted magnetic semiconductors (DMSs) have received much attention due to the
possibility of utilizing both charge and spin degrees of freedom. In order to achieve
functional spintronics devices, it is important to have a full control of the carrier density
and the ferromagnetic transition temperature (Tc). A newly-found DMS,
Ba1-yKy(Zn1-xMnx)2As2 [1], has Tc as high as 220 K. This material has an advantage that
the charge reservoir Ba layer and the ferromagnetic ZnAs layer are spatially separated.
This property allows us to independently control the amount of hole carriers by K
substitution to the Ba layer and that of magnetic elements by substituting Mn to the
ZnAs layer. In addition, the substitution of Zn atoms by isovalent Mn atoms enables us
to circumvent the low chemical solubility, which makes it possible to obtain
bulk-specimen samples. We have studied the electronic structure of
Ba1-yKy(Zn1-xMnx)2As2 by resonance photoemission spectroscopy (RPES), x-ray
absorption spectroscopy (XAS), and x-ray magnetic circular dichroism (XMCD). Mn
3d partial density of states deduced from RPES is similar to that in Ga1-xMnxAs. XAS
and XMCD spectra are also similar to Ga1-xMnxAs.
[1] K. Zhao et al., Nat. Commun. 4, 1442 (2013).
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