@article{Lyu2026, 
author = {Bingbing Lyu and Shuo Wang and Haiyan Zhu and Yupeng Zhu and Haimeng Wang and Chengzhe Chen and Cuiying Hu and Yeyang Guo and Jihui Fan and Xiji Shao and Yuantao Chen and Jifeng Shao and Mingyuan Huang and Yilin Wang},
title = {Geometrically frustrated antiferromagnetic order transition in two-dimensional van der Waals semiconductor MnIn2Se4},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {10},
pages = {94908938},
keywords = {geometrically frustrated antiferromagnetism, two-dimensional van der Waals magnetic materials, polarized Raman spectroscopy, phase transition},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908938},
doi = {10.26599/NR.2026.94908938},
abstract = {The geometrically frustrated antiferromagnetism, revealing non-mean-field ordering mechanisms through partial order, quantum fluctuations, and criticality, has long been a central focus in condensed matter physics for probing and manipulating novel phases of matter. However, the direct experimental observation of the phase transition associated with this frustrated antiferromagnetic order, termed “hidden order”, in two-dimensional systems remains a significant challenge. This is primarily due to the scarcity of suitable candidate materials and the limitations of conventional measurement techniques. Here, we investigate the magnetic properties of MnIn2Se4, a promising candidate for studying such transitions. Using a combination of polarized Raman spectroscopy, density functional theory (DFT), and Monte Carlo simulations calculations, we observe this geometrically frustrated antiferromagnetism order that persists from the spin-freezing temperature of 3.5 K up to 180 K. This transition is characterized by pronounced magneto-optical scattering phenomena, manifested by two distinct broad spectral regions of continuous magnetic states, with inflection points emerging at 180 K. Additionally, we detect temperature-dependent quasi-elastic scattering (QES) and Fano resonance, further confirming the magnetic order change. The presence of geometrically frustrated interactions in this material provides a natural explanation for the observed extended temperature range of the partial order phase. These findings establish MnIn2Se4 as a promising material platform for investigating frustration-driven phase transitions and the underlying mechanisms of high-temperature superconductivity and quantum bits. The insights gained into the interplay between thermal fluctuation effects on magnetic interactions may open new avenues for designing functional semiconductor devices with tunable magnetic and topological characteristics.}
}