中国物理B ›› 2022, Vol. 31 ›› Issue (8): 87102-087102.doi: 10.1088/1674-1056/ac7210

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Effect of f-c hybridization on the $\gamma\to \alpha$ phase transition of cerium studied by lanthanum doping

Yong-Huan Wang(王永欢)1,†, Yun Zhang(张云)1,†, Yu Liu(刘瑜)2,†, Xiao Tan(谈笑)1, Ce Ma(马策)1, Yue-Chao Wang(王越超)2, Qiang Zhang(张强)1, Deng-Peng Yuan(袁登鹏)1, Dan Jian(简单)1, Jian Wu(吴健)1, Chao Lai(赖超)1, Xi-Yang Wang(王西洋)1, Xue-Bing Luo(罗学兵)1, Qiu-Yun Chen(陈秋云)1, Wei Feng(冯卫)1, Qin Liu(刘琴)1, Qun-Qing Hao(郝群庆)1, Yi Liu(刘毅)1, Shi-Yong Tan(谭世勇)1, Xie-Gang Zhu(朱燮刚)1,‡, Hai-Feng Song(宋海峰)2,§, and Xin-Chun Lai(赖新春)1,¶   

  1. 1 Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou 621908, China;
    2 Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • 收稿日期:2022-04-10 修回日期:2022-05-09 接受日期:2022-05-23 出版日期:2022-07-18 发布日期:2022-07-18
  • 通讯作者: Xie-Gang Zhu, Hai-Feng Song, Xin-Chun Lai E-mail:zhuxiegang@caep.cn;song_haifeng@iapcm.ac.cn;laixinchun@caep.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2021YFA1601100 and 2017YFA0303104), the SPC-Lab Research Fund (Grant No. WDZC201901), the Science Challenge Project (Grant Nos. TZ2016004 and TZ2018002), the National Natural Science Foundation of China (Grant Nos. U1630248, 11774320, and 11904334), Special Funds of Institute of Materials (Grant No. TP02201904), and the Development Funds (Grant No. JZX7Y201901SY00900107).

Effect of f-c hybridization on the $\gamma\to \alpha$ phase transition of cerium studied by lanthanum doping

Yong-Huan Wang(王永欢)1,†, Yun Zhang(张云)1,†, Yu Liu(刘瑜)2,†, Xiao Tan(谈笑)1, Ce Ma(马策)1, Yue-Chao Wang(王越超)2, Qiang Zhang(张强)1, Deng-Peng Yuan(袁登鹏)1, Dan Jian(简单)1, Jian Wu(吴健)1, Chao Lai(赖超)1, Xi-Yang Wang(王西洋)1, Xue-Bing Luo(罗学兵)1, Qiu-Yun Chen(陈秋云)1, Wei Feng(冯卫)1, Qin Liu(刘琴)1, Qun-Qing Hao(郝群庆)1, Yi Liu(刘毅)1, Shi-Yong Tan(谭世勇)1, Xie-Gang Zhu(朱燮刚)1,‡, Hai-Feng Song(宋海峰)2,§, and Xin-Chun Lai(赖新春)1,¶   

  1. 1 Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou 621908, China;
    2 Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • Received:2022-04-10 Revised:2022-05-09 Accepted:2022-05-23 Online:2022-07-18 Published:2022-07-18
  • Contact: Xie-Gang Zhu, Hai-Feng Song, Xin-Chun Lai E-mail:zhuxiegang@caep.cn;song_haifeng@iapcm.ac.cn;laixinchun@caep.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2021YFA1601100 and 2017YFA0303104), the SPC-Lab Research Fund (Grant No. WDZC201901), the Science Challenge Project (Grant Nos. TZ2016004 and TZ2018002), the National Natural Science Foundation of China (Grant Nos. U1630248, 11774320, and 11904334), Special Funds of Institute of Materials (Grant No. TP02201904), and the Development Funds (Grant No. JZX7Y201901SY00900107).

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摘要： The hybridization between the localized 4f level (f) with conduction (c) electrons in $\gamma $-Ce upon cooling has been previously revealed in single crystalline thin films experimentally and theoretically, whereas its influence on the $\gamma \to \alpha $ phase transition was not explicitly verified, due to the fact that the phase transition happened in the bulk-layer, leaving the surface in the $\gamma $ phase. Here in our work, we circumvent this issue by investigating the effect of alloying addition of La on Ce, by means of crystal structure, electronic transport and angle resolved photoemission spectroscopy measurements, together with a phenomenological periodic Anderson model and a modified Anderson impurity model. Our current researches indicate that the weakening of f-c hybridization is the major factor in the suppression of $\gamma \to \alpha $ phase transition by La doping. The consistency of our results with the effects of other rare earth and actinide alloying additions on the $\gamma \to \alpha $ phase transition of Ce is also discussed. Our work demonstrates the importance of the interaction between f and c electrons in understanding the unconventional phase transition in Ce, which is intuitive for further researches on other rare earth and actinide metals and alloys with similar phase transition behaviors.

关键词: structural phase transition, molecular beam epitaxy, ARPES, f-electron system

Abstract: The hybridization between the localized 4f level (f) with conduction (c) electrons in $\gamma $-Ce upon cooling has been previously revealed in single crystalline thin films experimentally and theoretically, whereas its influence on the $\gamma \to \alpha $ phase transition was not explicitly verified, due to the fact that the phase transition happened in the bulk-layer, leaving the surface in the $\gamma $ phase. Here in our work, we circumvent this issue by investigating the effect of alloying addition of La on Ce, by means of crystal structure, electronic transport and angle resolved photoemission spectroscopy measurements, together with a phenomenological periodic Anderson model and a modified Anderson impurity model. Our current researches indicate that the weakening of f-c hybridization is the major factor in the suppression of $\gamma \to \alpha $ phase transition by La doping. The consistency of our results with the effects of other rare earth and actinide alloying additions on the $\gamma \to \alpha $ phase transition of Ce is also discussed. Our work demonstrates the importance of the interaction between f and c electrons in understanding the unconventional phase transition in Ce, which is intuitive for further researches on other rare earth and actinide metals and alloys with similar phase transition behaviors.

Key words: structural phase transition, molecular beam epitaxy, ARPES, f-electron system

中图分类号:  (Strongly correlated electron systems; heavy fermions)

  • 71.27.+a
64.60.-i (General studies of phase transitions) 79.60.-i (Photoemission and photoelectron spectra) 81.15.-z (Methods of deposition of films and coatings; film growth and epitaxy)