Charge-driven first-order magnetic transition in NiPS 3

Cross-coupling among the fundamental degrees of freedom in solids has been a long-standing problem in condensed matter physics. Despite its progress using predominantly three-dimensional materials, how the same physics plays out for two-dimensional materials is unknown. Here, we show that using P nu...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2025-02, Vol.37 (5), p.55801
Main Authors: Hwang, Junik, Park, Seonghoon, Hyun Kim, Beom, Kim, Junghyun, Park, Je-Geun, Baek, Seung-Ho
Format: Article
Language:English
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Summary:Cross-coupling among the fundamental degrees of freedom in solids has been a long-standing problem in condensed matter physics. Despite its progress using predominantly three-dimensional materials, how the same physics plays out for two-dimensional materials is unknown. Here, we show that using P nuclear magnetic resonance (NMR), the van der Waals antiferromagnet NiPS undergoes a first-order magnetic phase transition due to the strong charge-spin coupling in a honeycomb lattice. Our P NMR spectrum near the Néel ordering temperatureTN=155 K exhibits the coexistence of paramagnetic and antiferromagnetic phases within a finite temperature range. Furthermore, we observed a discontinuity in the order parameter atTNand the complete absence of critical behavior of spin fluctuations aboveTN, decisively establishing the first-order nature of the magnetic transition. We propose that a charge stripe instability arising from a Zhang-Rice triplet ground state triggers the first-order magnetic transition.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ad8ea0