Discovery of Charge Density Wave in a Kagome Lattice Antiferromagnet

January 31, 2023
Discovery of Charge Density Wave in a Kagome Lattice Antiferromagnet
Top: (a) Crystal structure of the paramagnetic (PM) phase (T>TN). (b) Magnetic structure in temperature regime TN>T>TCDW and (c) Magnetic structure in TCanting > T >TCDW. Bottom: Schematic of the [H, 0, L] plane reciprocal space maps in the PM phase, AFM phase and AFM + CDW phase. Lattice Bragg peaks, AFM peaks and CDW peaks are shown with grey, orange and blue dots, respectively.

Scientific Achievement

A charge density wave (CDW) emerges in the antiferromagnetic (AFM) ordered phase of kagome lattice FeGe.

Significance and Impact

Generally, CDWs either precede or accompany the formation of long-range magnetic order. The unexpected observation of the CDW forming with AFM already present represents a new paradigm for emergent phenomena in these materials.

Research Details

  • Neutron and X-ray scattering measurements were performed on a 30 mg single crystal of FeGe.
  • Electrical and magneto-transport measurements were carried out in a 14-T PPMS.
  • The magnetic field dependence of the susceptibility was measured using a Quantum Design physical property measurement system (PPMS).

"Discovery of charge density wave in a kagome lattice antiferromagnet”
Xiaokun Teng, Lebing Chen, Feng Ye, Elliott Rosenberg, Zhaoyu Liu, Jia-Xin Yin, Yu-Xiao Jiang, Ji Seop Oh, M. Zahid Hasan, Kelly J. Neubauer, Bin Gao, Yaofeng Xie, Makoto Hashimoto, Donghui Lu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Robert J. Birgeneau, Jiun-Haw Chu, Ming Yi and Pengcheng Dai
Nature 609, pages 490–495 (2022). DOI: https://10.1038/s41586-022-05034-z