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Magnetic Interactions in Ge/1-x/Cr/x/Te Semimagnetic Semiconductors
- Source :
- J. Appl. Phys. 112, 123909 (2012)
- Publication Year :
- 2012
-
Abstract
- We present the studies of magnetic properties of Ge/1-x/Cr/x/Te diluted magnetic semiconductor with changeable chemical composition 0.016 \leq x \leq 0.061. A spin-glass state (at T \leq 35 K) for x = 0.016 and 0.025 and a ferromagnetic phase (at T < 60 K) for x \geq 0.030 are observed. The long range carrier-mediated magnetic interactions are found to be responsible for the observed magnetic ordering for x < 0.045, while for x \geq 0.045 the spinodal decomposition of Cr ions leads to a maximum and decrease of the Curie temperature, TC, with increasing x. The calculations based on spin waves model are able to reproduce the observed magnetic properties at a homogeneous limit of Cr alloying, e.g. x < 0.04, and prove that carrier mediated Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction is responsible for the observed magnetic states. The value of the Cr-hole exchange integral, Jpd, estimated via fitting of the experimental results with the theoretical model, is in the limits 0.77...0.88 eV.<br />Comment: 8 pages, 7 figures
- Subjects :
- Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Journal :
- J. Appl. Phys. 112, 123909 (2012)
- Publication Type :
- Report
- Accession number :
- edsarx.1203.3044
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1063/1.4769795