Element-specific density of states of Co2MnGe revealed by resonant photoelectron spectroscopy

Takashi Kono, Masaaki Kakoki, Tomoki Yoshikawa, Xiaoxiao Wang, Kazuki Sumida, Koji Miyamoto, Takayuki Muro, Yukiharu Takeda, Yuji Saitoh, Kazuki Goto, Yuya Sakuraba, Kazuhiro Hono, and Akio Kimura
Phys. Rev. B 100, 165120 – Published 14 October 2019

Abstract

Resonant photoelectron spectroscopy at the Co and Mn 2p core absorption edges of half-metallic Co2MnGe has been performed to determine the element-specific density of states (DOS). A significant contribution of the Mn 3d partial DOS near the Fermi level (EF) was clarified by measurement at the Mn 2p absorption edge. Further analysis by first-principles calculation revealed that it has t2g symmetry, which must be responsible for the electrical conductivity along the line perpendicular to the film plane. The dominant normal Auger contribution observed at the Co 2p absorption edge indicates delocalization of photoexcited Co 3d electrons. The difference in the degrees of localization of the Mn 3d and Co 3d electrons in Co2MnGe is explained by the first-principles calculation. Our findings of the element-/orbital-specific electronic states near EF will pave the way for future interface design of magnetic tunneling junctions to overcome the temperature-induced reduction of the magnetoresistance.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 24 July 2019

DOI:https://doi.org/10.1103/PhysRevB.100.165120

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Takashi Kono1,*, Masaaki Kakoki1, Tomoki Yoshikawa1, Xiaoxiao Wang1, Kazuki Sumida1,2, Koji Miyamoto3, Takayuki Muro4, Yukiharu Takeda5, Yuji Saitoh5, Kazuki Goto6, Yuya Sakuraba6, Kazuhiro Hono6, and Akio Kimura1,†

  • 1Department of Physical Sciences, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-hiroshima 739-8526, Japan
  • 2Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
  • 3Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-hiroshima 739-0046, Japan
  • 4Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
  • 5Materials Sciences Research Center, Japan Atomic Energy Agency, Hyogo 679-5148, Japan
  • 6National Institute for Materials Science, Sengen 1-2-1, Tsukuba 305-0047, Japan

  • *takashi-kono@hiroshima-u.ac.jp
  • akiok@hiroshima-u.ac.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 100, Iss. 16 — 15 October 2019

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

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
×