Enhanced ferromagnetic transition temperature induced by a microscopic structural rearrangement in the diluted magnetic semiconductor Ge1-x MnxTe

M. Kriener, T. Nakajima, Y. Kaneko, A. Kikkawa, D. Hashizume, K. Kato, M. Takata, T. Arima, Y. Tokura, Y. Taguchi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The correlation between magnetic properties and microscopic structural aspects in the diluted magnetic semiconductor Ge1-xMnxTe is investigated by x-ray diffraction and magnetization as a function of the Mn concentration x. The occurrence of high ferromagnetic-transition temperatures in the rhombohedrally distorted phase of slowly cooled Ge1-xMnxTe is shown to be directly correlated with the formation and coexistence of strongly distorted Mn-poor and weakly distorted Mn-rich regions. It is demonstrated that the weakly distorted phase fraction is responsible for the occurrence of high-transition temperatures in Ge1-xMnxTe. When the Mn concentration becomes larger, the Mn-rich regions start to switch into the undistorted cubic structure, and the transition temperature is suppressed concurrently. By identifying suitable annealing conditions, we successfully increased the transition temperature to above 200 K for Mn concentrations close to the cubic phase. Structural data indicate that the weakly distorted phase fraction can be restored at the expense of the cubic regions upon the enhancement of the transition temperature, clearly establishing the direct link between high-transition temperatures and the weakly distorted Mn-rich phase fraction.

Original languageEnglish
Article number224418
JournalPhysical Review B
Volume95
Issue number22
DOIs
Publication statusPublished - 2017 Jun 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Enhanced ferromagnetic transition temperature induced by a microscopic structural rearrangement in the diluted magnetic semiconductor Ge1-x MnxTe'. Together they form a unique fingerprint.

Cite this