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arXiv · 2601.17475

Complex spin dynamics induced metamagnetic phase transitions in Dirac semimetal EuAuBi

Lipika·Shobha Singh·Anyesh Saraswati·Vikas Chahar·Yan Sun·Pascal Manuel·Devashibhai Adroja·Walter Schnelle·Nitesh Kumar·Jhuma Sannigrahi·Kaustuv Manna
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Abstract

We report a comprehensive investigation of the physical properties of the Dirac semimetal compound EuAuBi single crystals, using neutron diffraction, magnetization, electrical transport, and specific heat measurements. EuAuBi crystallizes in a hexagonal structure with space group P63mc (No. 186). First-principles calculations using density functional theory characterize it as a Dirac semimetal, with a notable band-crossing in proximity to the Fermi level (EF ) along the {\Gamma}-A direction. The crystal exhibits three distinct magnetic phases at 4 K (TN1), 3.5 K (TN2), and 2.8 K (TN3)as observed from magnetic and specific heat measurements. However, zero-field neutron diffraction resolves only two magnetic phases: a commensurate antiferromagnetic phase and a canted antiferromagnetic phase. Field-dependent ac and dc magnetization measurements uncover field-induced non-trivial spin textures in the magnetic field range 1.5 to 3 T, manifested as a tilted plateau in the magnetization curves. The interplay between conduction carriers and these spin textures is further evidenced by unique features in the magnetic field-dependent longitudinal resistivity in the system. Finally, we present a comprehensive magnetic phase diagram of EuAuBi, highlighting diverse spin alignments present in the material. EuAuBi thus emerges as a rare material system in which both momentum-space and real-space Berry curvature effects may coexist, providing a unique opportunity to investigate their interplay.

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Lipika, Shobha Singh, Anyesh Saraswati, Vikas Chahar, Yan Sun, Pascal Manuel, Devashibhai Adroja, Walter Schnelle, Nitesh Kumar, Jhuma Sannigrahi, Kaustuv Manna. 2026-01-24. Complex spin dynamics induced metamagnetic phase transitions in Dirac semimetal EuAuBi. https://doi.org/10.1103/dt26-56xc

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