Article Dans Une Revue Physical Review B Année : 2024

Magnetic versus nonmagnetic polymorphs of RuBr 3 under pressure

Résumé

Pressure evolution of the crystal structure and magnetism of the honeycomb ��−RuBr3 is studied using high-pressure x-ray diffraction, magnetometry, and density-functional band-structure calculations. Hydrostatic compression transforms antiferromagnetic ��−RuBr3 (��⁢ ‾ 3 ) into paramagnetic ��′−RuBr3 (��⁢ ‾ 1 ) where short Ru-Ru bonds cause magnetism collapse above 1.3 GPa at 0 K and 2.5 GPa at 295 K. Below this critical pressure, the Néel temperature of ��−RuBr3 increases with the slope of 1.8 K/GPa. Pressure tunes ��−RuBr3 away from the Kitaev limit, whereas increased third-neighbor in-plane coupling and interlayer coupling lead to a further stabilization of the collinear zigzag state. Both ��- and ��′−RuBr3 are metastable at ambient pressure, but their transformation into the thermodynamically stable �� polymorph is kinetically hindered at room temperature.
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Dates et versions

hal-04643063 , version 1 (20-11-2024)

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Bin Shen, Victoria A. Ginga, Angel Arevalo Lopez, Gaston Garbarino, Ece Uykur, et al.. Magnetic versus nonmagnetic polymorphs of RuBr 3 under pressure. Physical Review B, 2024, Phys. Rev. B, 109, ⟨10.1103/PhysRevB.109.224402⟩. ⟨hal-04643063⟩
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