Formation of a Simple Cubic Antiferromagnet through Charge Ordering in a Double Dirac Material

Published

October 16, 2025

Author(s)

T. Berry, Vincent Morano, T. Halloran, X. Zhang, T. Slade, A. Sapkota, S. Bud'ko, W. W. Xie, D. Ryan, Zhijun Xu, Yang Zhao, Jeffrey Lynn, T. Fennell, P. Canfield, Collin Broholm, T. McQueen

Abstract

Following the topological classification of electronic phases, interest has grown in materials with unique electronic or magnetic properties driven by topology and interactions. Here we report that the topologically nontrivial mixed valent intermetalllic EuPd3S4 undergoes long-range charge ordering at TCO = 340 K, wherein J = 7/2 Eu2+ and Van Vleck J = 0 Eu3+ ions on a body-centered-cubic lattice separate into two interpenetrating simple cubic sublattices. The reduced symmetry transmutes eightfold double Dirac states into fourfold Dirac states and leads to a simple cubic Heisenberg antiferromagnet with G-type antiferromagnetic order for T < TN = 2.85(6) K. While time reversal symmetry is broken, its combination with nearest neighbor lattice translation can form a nonsymmorphic symmetry preserving the fourfold Dirac point. The application of a magnetic field yields a spin flop transition at the lowest temperatures but, as a consequence of the extreme isotropy of Eu, that phase transition turns into a crossover at higher temperatures. Our work demonstrates how charge order modifies topology in EuPd3S4 and exposes an archetypal simple cubic Heisenberg antiferromagnet.

Citation

Physical Review B

Volume

112

Issue

15

Pub Type

Journals

Download Paper

https://doi.org/10.1103/5cdt-yhnx

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Keywords

Charge Order, Magnetic Order, Neutron Diffraction, Dirac Fermions, non-symmorphic symmetry

Citation

Berry, T. , Morano, V. , Halloran, T. , Zhang, X. , Slade, T. , Sapkota, A. , Bud'ko, S. , Xie, W. , Ryan, D. , Xu, Z. , Zhao, Y. , Lynn, J. , Fennell, T. , Canfield, P. , Broholm, C. and McQueen, T. (2025), Formation of a Simple Cubic Antiferromagnet through Charge Ordering in a Double Dirac Material, Physical Review B, [online], https://doi.org/10.1103/5cdt-yhnx, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=936125 (Accessed October 16, 2026)

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