Doping Effects on Magnetic and Electronic Transport Properties in (Ba<sub>1−x</sub>Rb<sub>x</sub>)(Zn<sub>1−y</sub>Mn<sub>y</sub>)<sub>2</sub>As<sub>2</sub> (0.1 ≤ x, y ≤ 0.25)

Doping Effects on Magnetic and Electronic Transport Properties in (Ba<sub>1−x</sub>Rb<sub>x</sub>)(Zn<sub>1−y</sub>Mn<sub>y</sub>)<sub>2</sub>As<sub>2</sub> (0.1 ≤ x, y ≤ 0.25)

Diluted magnetic semiconductors (DMSs) represent a significant area of interest for research and applications in spintronics. Recently, DMSs derived from BaZn<sub>2</sub>As<sub>2</sub> have garnered significant interest due to the record Curie temperature (<i>T</i>...

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Main Authors: Guoqiang Zhao, Yi Peng, Kenji M. Kojima, Yipeng Cai, Xiang Li, Kan Zhao, Shengli Guo, Wei Han, Yongqing Li, Fanlong Ning, Xiancheng Wang, Bo Gu, Gang Su, Sadamichi Maekawa, Yasutomo J. Uemura, Changqing Jin
Format: Article
Language:English
Published: MDPI AG 2025-06-01
Series:Nanomaterials
Subjects:
diluted magnetic semiconductor
colossal magnetoresistance
Curie temperature
carrier concentration
homogeneous ferromagnets
Online Access:https://www.mdpi.com/2079-4991/15/13/975
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Summary:Diluted magnetic semiconductors (DMSs) represent a significant area of interest for research and applications in spintronics. Recently, DMSs derived from BaZn<sub>2</sub>As<sub>2</sub> have garnered significant interest due to the record Curie temperature (<i>T</i><sub>C</sub>) of 260 K. However, the influence of doping on their magnetic evolution and transport characteristics has not been thoroughly investigated. This study aims to fill this gap through susceptibility and magnetization measurements, electric transport analysis, and muon spin relaxation and rotation (µSR) measurements on (Ba<sub>1−x</sub>Rb<sub>x</sub>)(Zn<sub>1−y</sub>Mn<sub>y</sub>)<sub>2</sub>As<sub>2</sub> (0.1 ≤ x, y ≤ 0.25, BRZMA). Key findings include the following: (1) BRZMA showed a maximum <i>T</i><sub>C</sub> of 138 K, much lower than (Ba,K)(Zn,Mn)<sub>2</sub>As, because of a reduced carrier concentration. (2) A substantial electromagnetic coupling is evidenced by a negative magnetoresistance of up to 34% observed in optimally doped BRZMA. (3) A 100% static magnetic ordered volume fraction is achieved in the low-temperature region, indicating a homogeneous magnet. (4) Furthermore, a systematic and innovative methodology has been initially proposed, characterized by clear step-by-step instructions aimed at enhancing <i>T</i><sub>C</sub>, grounded in robust experimental findings. The findings presented provide valuable insights into the spin–charge interplay concerning magnetic and electronic transport properties. Furthermore, they offer clear direction for the investigation of higher <i>T</i><sub>C</sub> DMSs.
ISSN:2079-4991

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