Fluorescence EXAFS analysis of local structures around Cr atoms in (Ga,Cr)As

H. Ofuchi, M. Yamada, J. Okabayashi, M. Mizuguchi, K. Ono, Y. Takeda, M. Oshima, H. Akinaga

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)

Abstract

In this work, geometric structures for diluted magnetic semiconductor (Ga,Cr)As films grown by low-temperature molecular beam epitaxy were investigated by fluorescence extended X-ray absorption fine structure (EXAFS) measurements. The XAFS analysis has revealed that the majority of Cr atoms in the (Ga,Cr)As film substitute the Ga atoms in the GaAs lattice up to the Cr content x=0.145. The abrupt change of the Cr-As bond lengths was observed between Cr content x=0.06 and 0.145, which is due to inhomogeneous distribution of Cr atoms in GaAs matrix. It is expected that the paramagnetic behavior at room temperature in the samples above x=0.145 is due to the inhomogeneous distribution of the Cr atoms doped in the GaAs matrix.

Original languageEnglish
Pages (from-to)651-653
Number of pages3
JournalPhysica B: Condensed Matter
Volume376-377
Issue number1
DOIs
Publication statusPublished - 2006 Apr 1
Externally publishedYes
EventProceedings of the 23rd International Conference on Defects in Semiconductors -
Duration: 2005 Jul 242005 Jul 29

Keywords

  • (Ga,Cr)As
  • EXAFS
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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