Physics – Condensed Matter – Materials Science
Scientific paper
2008-04-21
New J. Phys. 10, 055011 (2008)
Physics
Condensed Matter
Materials Science
Accepted for New Journal of Physics. Single column, 21 pages, 7 figures
Scientific paper
10.1088/1367-2630/10/5/055011
The electronic structure of the Cr ions in the diluted ferromagnetic semiconductor Zn$_{1-x}$Cr$_x$Te ($x=0.03$ and 0.15) thin films has been investigated using x-ray magnetic circular dichroism (XMCD) and photoemission spectroscopy (PES). Magnetic-field ($H$) and temperature ($T$) dependences of the Cr $2p$ XMCD spectra well correspond to the magnetization measured by a SQUID magnetometer. The line shape of the Cr $2p$ XMCD spectra is independent of $H$, $T$, and $x$, indicating that the ferromagnetism is originated from the same electronic states of the Cr ion. Cluster-model analysis indicates that although there are two or more kinds of Cr ions in the Zn$_{1-x}$Cr$_x$Te samples, the ferromagnetic XMCD signal is originated from Cr ions substituted for the Zn site. The Cr 3d partial density of states extracted using Cr $2p \to 3d$ resonant PES shows a broad feature near the top of the valence band, suggesting strong $s$,$p$-$d$ hybridization. No density of states is detected at the Fermi level, consistent with their insulating behavior. Based on these findings, we conclude that double exchange mechanism cannot explain the ferromagnetism in Zn$_{1-x}$Cr$_{x}$Te.
Ando Kazuma
Chen Chien-Tsu
Fujimori Atsushi
Fujimori S.-I.
Huang Jian Dong
No associations
LandOfFree
Local electronic structure of Cr in the II-VI diluted ferromagnetic semiconductor Zn$_{1-x}$Cr$_x$Te does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Local electronic structure of Cr in the II-VI diluted ferromagnetic semiconductor Zn$_{1-x}$Cr$_x$Te, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Local electronic structure of Cr in the II-VI diluted ferromagnetic semiconductor Zn$_{1-x}$Cr$_x$Te will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-36388