中国物理B ›› 2022, Vol. 31 ›› Issue (11): 117502-117502.doi: 10.1088/1674-1056/ac7858

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CrAlGe: An itinerant ferromagnet with strong tunability by heat treatment

Zhaokun Dong(董昭昆)1,2, Zhen Wang(王振)2,3, Te Zhang(张特)2,3, Junsen Xiang(项俊森)2,3, Shuai Zhang(张帅)2,3, Lihua Liu(刘丽华)1,†, and Peijie Sun(孙培杰)2,3,4,‡   

  1. 1 Department of Physics, Beijing Engineering Research Center of Detection and Application for Weak Magnetic field, University of Science and Technology Beijing, Beijing 100083, China;
    2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • 收稿日期:2022-03-19 修回日期:2022-06-07 接受日期:2022-06-14 出版日期:2022-10-17 发布日期:2022-10-17
  • 通讯作者: Lihua Liu, Peijie Sun E-mail:lhliu@ustb.edu.cn;pjsun@iphy.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 52088101, 11974389, and 12141002), the National Key Research and Development Program of China (Grant Nos. 2021YFA0718702 and 2017YFA0303100), and the Chinese Academy of Sciences through the Scientific Instrument Developing Project (Grant No. ZDKYYQ20210003), and the Strategic Priority Research Program (Grant No. XDB33000000).

CrAlGe: An itinerant ferromagnet with strong tunability by heat treatment

Zhaokun Dong(董昭昆)1,2, Zhen Wang(王振)2,3, Te Zhang(张特)2,3, Junsen Xiang(项俊森)2,3, Shuai Zhang(张帅)2,3, Lihua Liu(刘丽华)1,†, and Peijie Sun(孙培杰)2,3,4,‡   

  1. 1 Department of Physics, Beijing Engineering Research Center of Detection and Application for Weak Magnetic field, University of Science and Technology Beijing, Beijing 100083, China;
    2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • Received:2022-03-19 Revised:2022-06-07 Accepted:2022-06-14 Online:2022-10-17 Published:2022-10-17
  • Contact: Lihua Liu, Peijie Sun E-mail:lhliu@ustb.edu.cn;pjsun@iphy.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 52088101, 11974389, and 12141002), the National Key Research and Development Program of China (Grant Nos. 2021YFA0718702 and 2017YFA0303100), and the Chinese Academy of Sciences through the Scientific Instrument Developing Project (Grant No. ZDKYYQ20210003), and the Strategic Priority Research Program (Grant No. XDB33000000).

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摘要： We present a comprehensive investigation on CrAlGe and realize that it is an itinerant ferromagnet with strong tunability of the Curie temperature $T_{\rm C}$ and the spontaneous moment $\mu_0$ depending on annealing heat treatment. While the value of $T_{\rm C}$ was previously reported to be 80 K with $\mu_0\approx$ 0.41$\mu_{\rm B}$, in this work the two quantities attain values as high as 170 K and 0.66$\mu_{\rm B}$, respectively. Heat treatment does not cause changes of the lattice parameters and symmetry, but results in a slight narrowing of the Bragg peaks. The strong tunability of the itinerant ferromagnetism indicates significantly tunable hybridization between the Cr 3d electrons and the conduction bands, in agreement with the dominant Cr-Al/Ge bonds of this compound. Further tuning along the same line towards even stronger or weaker itinerant ferromagnetism promises an interesting follow-up to clarify the localized-itinerant duality of the 3d electrons in this compound.

关键词: itinerant ferromagnet, localized-itinerant duality, heat treatment, hybridization

Abstract: We present a comprehensive investigation on CrAlGe and realize that it is an itinerant ferromagnet with strong tunability of the Curie temperature $T_{\rm C}$ and the spontaneous moment $\mu_0$ depending on annealing heat treatment. While the value of $T_{\rm C}$ was previously reported to be 80 K with $\mu_0\approx$ 0.41$\mu_{\rm B}$, in this work the two quantities attain values as high as 170 K and 0.66$\mu_{\rm B}$, respectively. Heat treatment does not cause changes of the lattice parameters and symmetry, but results in a slight narrowing of the Bragg peaks. The strong tunability of the itinerant ferromagnetism indicates significantly tunable hybridization between the Cr 3d electrons and the conduction bands, in agreement with the dominant Cr-Al/Ge bonds of this compound. Further tuning along the same line towards even stronger or weaker itinerant ferromagnetism promises an interesting follow-up to clarify the localized-itinerant duality of the 3d electrons in this compound.

Key words: itinerant ferromagnet, localized-itinerant duality, heat treatment, hybridization

中图分类号:  (Intrinsic properties of magnetically ordered materials)

  • 75.30.-m
71.27.+a (Strongly correlated electron systems; heavy fermions) 75.30.Cr (Saturation moments and magnetic susceptibilities)