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Electronic band reconstruction across the insulator-metal transition in colossally magnetoresistive EuCd2P2

Huali Zhang1,*, Feng Du1,*, Xiaoying Zheng1, Shuaishuai Luo1, Yi Wu1, Hao Zheng1, Shengtao Cui2, Zhe Sun2, Zhengtai Liu3 et al.

Dawei Shen2, Michael Smidman1, Yu Song1, Ming Shi1, Zhicheng Zhong4, Chao Cao1, Huiqiu Yuan1,5,6,†, and Yang Liu1,5,‡

  • 1Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou 310058, China
  • 2National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
  • 3State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics, SIMIT, Chinese Academy of Science, Shanghai 200050, China
  • 4CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Ningbo 315201, China
  • 5Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 6State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310058, China

  • *These authors contributed equally to this work.
  • †hqyuan@zju.edu.cn
  • ‡yangliuphys@zju.edu.cn
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Phys. Rev. B 108, L241115 – Published 18 December, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L241115

Abstract

While colossal magnetoresistance (CMR) in Eu-based compounds is often associated with strong spin-carrier interactions, the underlying reconstruction of the electronic bands is much less understood from spectroscopic experiments. Here using angle-resolved photoemission, we directly observe an electronic band reconstruction across the insulator-metal (and magnetic) transition in the recently discovered CMR compound EuCd2P2. This transition is manifested by a large magnetic band splitting associated with the magnetic order, as well as unusual energy shifts of the valence bands: both the large ordered moment of Eu and carrier localization in the paramagnetic phase are crucial. Our results provide spectroscopic evidence for an electronic structure reconstruction underlying the enormous CMR observed in EuCd2P2, which could be important for understanding Eu-based CMR materials, as well as designing CMR materials based on large-moment rare-earth magnets.

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Phys. Rev. B 108, L241115– Published 18 December, 2023
  • Received 13 April 2023
  • Revised 2 November 2023
  • Accepted 4 December 2023
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