Frustration-driven unconventional magnetism in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mi>Mn</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> <mml:mo>+</mml:mo> </mml:mrow> </mml:msup> </mml:math> <m
The triple perovskite oxide ${\mathrm{Ba}}_{3}{\mathrm{MnTa}}_{2}{\mathrm{O}}_{9}$ has been synthesized, and its magnetic properties have been investigated through dc and ac magnetization, specific heat, electron spin resonance measurements, and density functional theory (DFT) calculations. ${\mathrm{Mn}}^{2+}$ $(S=\frac{5}{2})$ ions are the only magnetic species present in the material. These ${\mathrm{Mn}}^{2+}$ ions constitute a quasi-two-dimensional triangular network in the crystallographic $ab$ plane. Magnetization and specific heat measurements reveal the absence of any long-range magnetic order down to 0.5 K despite the presence of antiferromagnetic correlations between the magnetic ions, suggesting the presence of geometric frustration in the material. The entropy release is lower than the expected theoretical value of $Rln(6)$, further suggesting the presence of frustration. First-principles calculations using DFT and atomistic spin dynamics simulations further support this lack of static magnetic order even at low temperatures and identify the competing magnetic interactions along with the quasi-two-dimensional magnetic dimensionality as the underlying origin of this unconventional magnetic behavior.
Authors
- Rajorshi Mondal
- S. Gaß (ORCID: https://orcid.org/0000-0002-6759-6844)
- Anja U. B. Wolter (ORCID: https://orcid.org/0000-0001-5108-8047)
- Saikat Nandi (ORCID: https://orcid.org/0000-0001-6325-1745)
- T. Dey (ORCID: https://orcid.org/0000-0002-3244-0452)
- Bernd Büchner (ORCID: https://orcid.org/0000-0002-3886-2680)
- L. T. Corredor (ORCID: https://orcid.org/0000-0001-7590-0829)
- S. Wurmehl (ORCID: https://orcid.org/0000-0002-5841-5458)
- A. V. Mahajan (ORCID: https://orcid.org/0000-0003-3241-6660)
- A. Alfonsov (ORCID: https://orcid.org/0000-0003-2408-8628)
- V. Kataev (ORCID: https://orcid.org/0000-0003-2147-2616)
- S. K. Panda (ORCID: https://orcid.org/0000-0001-6675-3396)
- S. Chattopadhyay (ORCID: https://orcid.org/0000-0001-9061-2139)
- Sk. Soyeb Ali (ORCID: https://orcid.org/0009-0000-3695-8219)
Institutions
- Indian Institute of Technology Bombay (IN)
- Indian Institute of Technology Dhanbad (IN)
- Leibniz Institute for Solid State and Materials Research (DE)
- Bennett University (IN)
- UGC DAE Consortium for Scientific Research (IN)
- Technische Universität Dresden (DE)
Publication Details
- Journal
- Physical review. B./Physical review. B
- Published
- 2025-10-01
- DOI
- https://doi.org/10.1103/d36t-hb3k
- Citations
- 1
- Primary Topic
- Advanced Condensed Matter Physics
- Type
- article
- Field-Weighted Citation Impact
- 1.26
Funders
- Arthritis National Research Foundation
- National Research Foundation
- Department of Science and Technology, Ministry of Science and Technology, India
- Deutscher Akademischer Austauschdienst
- Deutsche Forschungsgemeinschaft
- Indian Institute of Technology (Indian School of Mines), Dhanbad
- Science and Engineering Research Board