Home > Publications database > Long-range magnetic order in CePdAl$_3$ enabled by orthorhombic deformation > print

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024 7 _ |a 10.1103/PhysRevResearch.6.023117
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100 1 _ |a Stekiel, Michal
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245 _ _ |a Long-range magnetic order in CePdAl$_3$ enabled by orthorhombic deformation
260 _ _ |a College Park, MD
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520 _ _ |a We investigate the effect of structural deformation on the magnetic properties of orthorhombic CePdAl3 in relation to its tetragonal polymorph. Utilizing x-ray and neutron diffraction, we establish that the crystal structure has the 𝐶⁢𝑚⁢𝑐⁢𝑚 space-group symmetry and exhibits pseudotetragonal twinning. According to density functional calculations, the tetragonal-orthorhombic deformation mechanism has its grounds in the relatively small free enthalpy difference between the polymorphs, allowing either phase to be quenched, and fully accounts for the twinned microstructure of the orthorhombic phase. Neutron diffraction measurements show that orthorhombic CePdAl3 establishes long-range magnetic order below 𝑇N=5.29⁢(5) K characterized by a collinear, antiferromagnetic arrangement of magnetic moments. Magnetic anisotropies of orthorhombic CePdAl3 arise from strong spin-orbit coupling as evidenced by the crystal-field splitting of the 4⁢𝑓 multiplet, fully characterised with neutron spectroscopy. We discuss the potential mechanism of frustration posed by antiferromagnetic interactions between nearest neighbors in the tetragonal phase, which hinders the formation of long-range magnetic order in tetragonal CePdAl3. We propose that orthorhombic deformation releases the frustration and allows for long-range magnetic order.
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700 1 _ |a Cermak, Petr
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773 _ _ |a 10.1103/PhysRevResearch.6.023117
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