Stripe antiferromagnetic order and spin dynamics in the Shastry-Sutherland Ising compound Er2Be2GeO7
Abstract
In rare-earth compounds, the interplay between geometric frustration and unusual single-ion anisotropy caused by the crystal electric field often leads to exotic magnetic phases. Here, we investigate the magnetic properties of the rare-earth Shastry-Sutherland compound Er2Be2GeO7 using bulk measurements and neutron scattering down to sub-Kelvin temperatures. A k=(0,0,0) stripe-like antiferromagnetic order with locally tilted Er3+ moments is revealed by time-of-flight neutron powder diffraction, accompanied with a λ-shape specific-heat anomaly at TN=0.84 K. The temperature dependence of the magnetic peak intensity corresponding to the ordered moment of Er3+ approximates to the two-dimensional Ising universality class. Thermal- and cold-neutron inelastic scattering experiments demonstrate that the strong Ising anisotropy originates from the local crystal electric field, and reveal gapped magnetic excitations with weak dispersion in the ordered state. Mean-field random-phase approximation with inequivalent nearest-neighbor couplings accounts well for the collective excitations, while classical Monte Carlo simulations yield the fractional 1/4 and 1/2 magnetization plateaus. Our work provides a comprehensive description of the spin correlations in Er2Be2GeO7 with a particular focus on the classical origin of its fractional magnetization plateaus.
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BibTeX
@misc{cheng2026stripe,
title = {{Stripe antiferromagnetic order and spin dynamics in the Shastry-Sutherland Ising compound Er2Be2GeO7}},
author = {Donger Cheng and Otkur Omar and Wenbin Wei and Jan Peter Embs and Xiao Wang and Cheng Su and Hui Cheng and Zhengdong Fu and Xinzhi Liu and Wentao Jin and Ze Hu and Wei Luo and Liming Wang and Jiazheng Hao and Feiran Shen and Lunhua He and Shang Gao and Erxi Feng},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.36799},
eprint = {2610.36799},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.36799},
}
RIS
TY - UNPB
TI - Stripe antiferromagnetic order and spin dynamics in the Shastry-Sutherland Ising compound Er2Be2GeO7
AU - Donger Cheng
AU - Otkur Omar
AU - Wenbin Wei
AU - Jan Peter Embs
AU - Xiao Wang
AU - Cheng Su
AU - Hui Cheng
AU - Zhengdong Fu
AU - Xinzhi Liu
AU - Wentao Jin
AU - Ze Hu
AU - Wei Luo
AU - Liming Wang
AU - Jiazheng Hao
AU - Feiran Shen
AU - Lunhua He
AU - Shang Gao
AU - Erxi Feng
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.36799
UR - https://arxiv.org/abs/2610.36799
AB - In rare-earth compounds, the interplay between geometric frustration and unusual single-ion anisotropy caused by the crystal electric field often leads to exotic magnetic phases. Here, we investigate the magnetic properties of the rare-earth Shastry-Sutherland compound Er_2Be_2GeO_7 using bulk measurements and neutron scattering down to sub-Kelvin temperatures. A k=(0,0,0) stripe-like antiferromagnetic order with locally tilted Er^3+ moments is revealed by time-of-flight neutron powder diffraction, accompanied with a λ-shape specific-heat anomaly at T_N=0.84 K. The temperature dependence of the magnetic peak intensity corresponding to the ordered moment of Er^3+ approximates to the two-dimensional Ising universality class. Thermal- and cold-neutron inelastic scattering experiments demonstrate that the strong Ising anisotropy originates from the local crystal electric field, and reveal gapped magnetic excitations with weak dispersion in the ordered state. Mean-field random-phase approximation with inequivalent nearest-neighbor couplings accounts well for the collective excitations, while classical Monte Carlo simulations yield the fractional 1/4 and 1/2 magnetization plateaus. Our work provides a comprehensive description of the spin correlations in Er_2Be_2GeO_7 with a particular focus on the classical origin of its fractional magnetization plateaus.
ER -