Direct observation of twisted stacking domains in the van der Waals magnet CrI3

Myeongjin Jang, Sol Lee, Fernando Cantos-Prieto, Ivona Košić, Yue Li, Arthur R. C. McCray, Min-Hyoung Jung, Jun-Yeong Yoon, Loukya Boddapati, Francis Leonard Deepak, Hu Young Jeong, Charudatta M. Phatak, Elton J. G. Santos (), Efrén Navarro-Moratalla () and Kwanpyo Kim ()
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Myeongjin Jang: Yonsei University
Sol Lee: Yonsei University
Fernando Cantos-Prieto: Instituto de Ciencia Molecular, Universitat de València
Ivona Košić: Instituto de Ciencia Molecular, Universitat de València
Yue Li: Argonne National Laboratory
Arthur R. C. McCray: Argonne National Laboratory
Min-Hyoung Jung: Sungkyunkwan University (SKKU)
Jun-Yeong Yoon: Yonsei University
Loukya Boddapati: International Iberian Nanotechnology Laboratory
Francis Leonard Deepak: International Iberian Nanotechnology Laboratory
Hu Young Jeong: Ulsan National Institute of Science and Technology
Charudatta M. Phatak: Argonne National Laboratory
Elton J. G. Santos: The University of Edinburgh
Efrén Navarro-Moratalla: Instituto de Ciencia Molecular, Universitat de València
Kwanpyo Kim: Yonsei University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Van der Waals (vdW) stacking is a powerful technique to achieve desired properties in condensed matter systems through layer-by-layer crystal engineering. A remarkable example is the control over the twist angle between artificially-stacked vdW crystals, enabling the realization of unconventional phenomena in moiré structures ranging from superconductivity to strongly correlated magnetism. Here, we report the appearance of unusual 120° twisted faults in vdW magnet CrI3 crystals. In exfoliated samples, we observe vertical twisted domains with a thickness below 10 nm. The size and distribution of twisted domains strongly depend on the sample preparation methods, with as-synthesized unexfoliated samples showing tenfold thicker domains than exfoliated samples. Cooling induces changes in the relative populations among different twisting domains, rather than the previously assumed structural phase transition to the rhombohedral stacking. The stacking disorder induced by sample fabrication processes may explain the unresolved thickness-dependent magnetic coupling observed in CrI3.

Date: 2024
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DOI: 10.1038/s41467-024-50314-z

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