Impurity position and lattice distortion in a Mn-doped Bi2Te3 topological insulator investigated by x-ray fluorescence holography and x-ray absorption fine structure

Shinya Hosokawa, Jens Rüdiger Stellhorn, Tomohiro Matsushita, Naohisa Happo, Koji Kimura, Koichi Hayashi, Yoshihiro Ebisu, Toru Ozaki, Hiroyuki Ikemoto, Hiroyuki Setoyama, Toshihiro Okajima, Yoshitaka Yoda, Hirofumi Ishii, Yen-Fa Liao, Mamoru Kitaura, and Minoru Sasaki
Phys. Rev. B 96, 214207 – Published 26 December 2017

Abstract

Mn Kα x-ray fluorescence holography (XFH) measurements were performed on a single crystal of a Bi2Te3Mn0.1 topological insulator at 100 and 300 K to search for the impurity sites of the Mn atoms in this functional crystal. The three-dimensional atomic images were reconstructed using an L1-regularized linear regression. X-ray absorption fine-structure (XAFS) experiments were also carried out at 30–300 K to obtain additional structural information. The local structural information was obtained from these data, such as the positions of the Mn impurity sites, the Mn-Te interatomic distances, the lattice distortions, and the positional fluctuations around the impurity Mn atoms. The possible Mn impurity sites are twofold, i.e., an interlayer site with an octahedral symmetry and a substitutional site of Te on the layer surface. A distinct temperature dependence is seen in the positional fluctuations of the impurity Mn atoms in the substitutional site. These findings for the impurity sites cannot be easily obtained by diffraction or XAFS experiment in the usual way, but only using a combination of the XFH and XAFS measurements.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
4 More
  • Received 28 August 2017

DOI:https://doi.org/10.1103/PhysRevB.96.214207

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Shinya Hosokawa1,*, Jens Rüdiger Stellhorn1, Tomohiro Matsushita2, Naohisa Happo3, Koji Kimura4, Koichi Hayashi4, Yoshihiro Ebisu5, Toru Ozaki5, Hiroyuki Ikemoto6, Hiroyuki Setoyama7, Toshihiro Okajima7, Yoshitaka Yoda2, Hirofumi Ishii8, Yen-Fa Liao8, Mamoru Kitaura9, and Minoru Sasaki9

  • 1Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan
  • 2Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
  • 3Graduate School of Information Sciences, Hiroshima City University, Hiroshima 731-3194, Japan
  • 4Department of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
  • 5Research Center for Condensed Matter Physics, Graduate School of Science and Technology, Hiroshima Institute of Technology, Hiroshima 731-5193, Japan
  • 6Department of Physics, Faculty of Science, University of Toyama, Toyama 930-8555, Japan
  • 7Kyushu Synchrotron Light Research Center, Tosu 841-0005, Japan
  • 8National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
  • 9Department of Physics, Faculty of Science, Yamagata University, Yamagata 990-8560, Japan

  • *hosokawa@sci.kumamoto-u.ac.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 96, Iss. 21 — 1 December 2017

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×