journal article·2020-02-01Open access

High Curie temperature in Eu-doped GaN caused by volume-compensated Ga-vacancy

Akira Masago, Hikari Shinya, Tetsuya Fukushima, Kazunori Sato, Hiroshi Katayama-Yoshida

AIP Advances· Volume 10· Issue 2

Abstract

This study computationally demonstrates that room-temperature ferromagnetism, which has been experimentally observed in Eu-doped GaN, is induced by holes in N 2p states (i.e., Zener’s double exchange interaction) that arise on the assumption that Ga vacancies appear as a result of the introduction of Eu ions (i.e., volume compensation). The calculated Curie temperature (TC) suddenly increases over a certain range of Ga-vacancy concentrations and gradually increases with an increasing concentration of Eu ions. High TC above room temperature is dominated by Zener’s double exchange mechanism in partially occupied N 2p hole-states, which itinerate throughout the whole crystals, and low TC is dominated by Zener’s p-f exchange mechanism in Eu 4f and N 2p hybridization. We can reasonably explain the surprising experimental data of 4000 μB per Gd atom in Gd-doped GaN reported by Dhar et al. [Phys. Rev. Lett. 94, 037205 (2005)].
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Research context

OpenAlex topics: ZnO doping and properties · GaN-based semiconductor devices and materials · Ga2O3 and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Spintronics Research Network, Graduate School of Engineering Science, Osaka University 1 , Toyonaka, Osaka 560-8531, Japan

Research Institute of Electrical Communication, Tohoku University 2 , Sendai 980-8577, Japan

The Institute of Solid State Physics, The University of Tokyo 3 , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

Graduate School of Engineering, Osaka University 4 , 2-1 Yamadaoka, Suita 565-0871, Japan

Center for Spintronics Research Network, Graduate School of Engineering 5 , , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

The University of Tokyo 5 , , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Funding

Japan Society for the Promotion of Science · Core Research for Evolutional Science and Technology

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