Long-range magnetic order in CePdAl3 enabled by orthorhombic deformation
Year: 2024
Type: article
Abstract: 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 Cmcm 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 4f 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. Published by the American Physical Society 2024
Source: Physical Review Research
Authors: M. Stekiel, P. Čermák, C. Franz, M. Meven, D. Legut, W. Simeth, U. B. Hansen, B. Fåk, S. Weber, R. Schönmann, V. Kumar, K. Nemkovski, H. Deng, A. Bauer, C. Pfleiderer, A. Schneidewind
Institutions: Forschungszentrum Jülich, Heinz Maier-Leibnitz Zentrum, Technical University of Munich, Charles University, RWTH Aachen University, VSB - Technical University of Ostrava, Institut Laue-Langevin, Rutherford Appleton Laboratory, Science and Technology Facilities Council, ISIS Neutron and Muon Source, Munich Center for Quantum Science and Technology
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
Awards: G1275179083, G3216305517, Magnetism at interfaces: from quantum to reality, Emergente Elektrodynamik Topologischer Spintexturen, Magnetoelastic Materials beyond Born-Oppenheimer Approximation, G6241738045, Mehrkomponentige Elektronische Korrelationen in NichtZentrosymmetrischen fElektronVerbindungen, TRR 360: Eingeschränkte Quantenmaterie, G7833680663, TRR 80: Von elektronischen Korrelationen zur Funktionalität, EXC 2111: Munich Center for Quantum Science and Technology (MCQST)
OpenAlex ID: W4396578989