Journal Article

FZJ-2024-02173

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Long-range magnetic order in CePdAl$_3$ enabled by orthorhombic deformation

Stekiel, M. (Corresponding author)FZJ* ; Cermak, P. ; Franz, C.FZJ* ; Meven, M.FZJ* ; Legut, D. ; Simeth, W.Extern* ; Hansen, U. B.Extern* ; Fak, B. ; Weber, S. ; Schönmann, R. ; Kumar, V. ; Nemkovskiy, K. ; Deng, H.RWTH* ; Bauer, A. ; Pfleiderer, C. (Last author) ; Schneidewind, A. (Last author)FZJ*

2024
APS College Park, MD

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Please use a persistent id in citations: doi:10.1103/PhysRevResearch.6.023117  doi:10.34734/FZJ-2024-02173

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 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.

Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Heinz Maier-Leibnitz Zentrum (MLZ)
3. JCNS-4 (JCNS-4)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
3. DFG project 323760292 - Mehrkomponentige Elektronische Korrelationen in Nicht-Zentrosymmetrischen f-Elektron-Verbindungen (323760292) (323760292)
4. DFG project 403191981 - Emergente Elektrodynamik Topologischer Spintexturen (403191981) (403191981)
5. DFG project 390814868 - EXC 2111: Munich Center for Quantum Science and Technology (MCQST) (390814868) (390814868)
6. TOPFIT - Topological Spin Solitons for Information Technology (291079) (291079)
7. ExQuiSid - Extreme Quantum Matter in Solids (788031) (788031)
8. DFG project 107745057 - TRR 80: Von elektronischen Korrelationen zur Funktionalität (107745057) (107745057)
9. DFG project 492547816 - TRR 360: Eingeschränkte Quantenmaterie (492547816) (492547816)

Experiment(s):

1. DNS: Diffuse scattering neutron time of flight spectrometer (NL6S)
2. HEiDi: Single crystal diffractometer on hot source (SR9b)

Appears in the scientific report 2024

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Database coverage:
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