Role of composition-tuned disorder on magnetic exchange interactions in NiRuMnGa
Abstract
We report the experimental investigation of the quaternary Heusler alloy NiRuMnGa, complemented by first-principles calculations. The energetically favorable crystal structure was identified from first-principles calculations and subsequently used as the structural model for refinement of the powder X-ray diffraction data. The refinement shows good agreement with the experimental pattern and reveals substantial B2-type disorder involving Ni/Ru and Mn/Ga site intermixing. The dc magnetic response exhibits pronounced ZFC--FC irreversibility near ∼ 48 K, with the irreversibility temperature shifting toward lower temperatures under increasing magnetic field, indicating a field-sensitive glassy state. The isothermal magnetization remains unsaturated up to 7 T, reaching only ∼ 0.4 μB/f.u., accompanied by pronounced hysteresis, suggesting competing exchange interactions and frustrated magnetic moments. AC susceptibility, together with magnetic relaxation and memory measurements, confirms slow spin dynamics characteristic of a cluster glass state. The lack of a discernible heat-capacity anomaly near the irreversibility temperature further supports the absence of conventional long-range magnetic order. Collectively, these results demonstrate that competition between ferromagnetic and antiferromagnetic interactions in NiRuMnGa leads to magnetic frustration and stabilizes a cluster glass state.
Related
- Small-data physics-informed ML model for magnetic exchange based on chemical composition and structure
- Magnetic ground states of CrPS4 and NiPS3 monolayers from long-range exchange interactions
- Studying the evolution of exchange and dipolar interactions and spin correlation in vdW magnet CrCl3 across magnetic phases
- The effect of grain boundaries on magnetic exchange interactions in iron
- Magnetic exchange interactions in the molecular orbital spin system NaV2O5 from a distributed moment point of view
BibTeX
@misc{panda2026role,
title = {{Role of composition-tuned disorder on magnetic exchange interactions in NiRuMnGa}},
author = {Manikantha Panda and Prabuddha Kant Mishra and Vinod Kumar and Wilfrid Prellier and Rahul Sharma and Tapas Paramanik},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.13107},
eprint = {2610.13107},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.13107},
}
RIS
TY - UNPB
TI - Role of composition-tuned disorder on magnetic exchange interactions in NiRuMnGa
AU - Manikantha Panda
AU - Prabuddha Kant Mishra
AU - Vinod Kumar
AU - Wilfrid Prellier
AU - Rahul Sharma
AU - Tapas Paramanik
PY - 2026
DA - 2026/10/09
PB - arXiv
DO - 10.48550/arxiv.2610.13107
UR - https://arxiv.org/abs/2610.13107
AB - We report the experimental investigation of the quaternary Heusler alloy NiRuMnGa, complemented by first-principles calculations. The energetically favorable crystal structure was identified from first-principles calculations and subsequently used as the structural model for refinement of the powder X-ray diffraction data. The refinement shows good agreement with the experimental pattern and reveals substantial B2-type disorder involving Ni/Ru and Mn/Ga site intermixing. The dc magnetic response exhibits pronounced ZFC--FC irreversibility near ∼ 48 K, with the irreversibility temperature shifting toward lower temperatures under increasing magnetic field, indicating a field-sensitive glassy state. The isothermal magnetization remains unsaturated up to 7 T, reaching only ∼ 0.4 μ_B/f.u., accompanied by pronounced hysteresis, suggesting competing exchange interactions and frustrated magnetic moments. AC susceptibility, together with magnetic relaxation and memory measurements, confirms slow spin dynamics characteristic of a cluster glass state. The lack of a discernible heat-capacity anomaly near the irreversibility temperature further supports the absence of conventional long-range magnetic order. Collectively, these results demonstrate that competition between ferromagnetic and antiferromagnetic interactions in NiRuMnGa leads to magnetic frustration and stabilizes a cluster glass state.
ER -