• Medientyp: E-Artikel
  • Titel: Low-temperature antiferromagnetic order in orthorhombic CePdAl 3
  • Beteiligte: Kumar, Vivek [VerfasserIn]; Bauer, Andreas [VerfasserIn]; Franz, Christian [VerfasserIn]; Spallek, Jan [VerfasserIn]; Schönmann, Rudolf [VerfasserIn]; Stekiel, Michal [VerfasserIn]; Schneidewind, Astrid [VerfasserIn]; Wilde, Marc A. [VerfasserIn]; Pfleiderer, C. [VerfasserIn]
  • Erschienen: APS, 2023
  • Erschienen in: Physical review research 5(2), 023157 (2023). doi:10.1103/PhysRevResearch.5.023157
  • Sprache: Englisch
  • DOI: https://doi.org/10.1103/PhysRevResearch.5.023157; https://doi.org/10.34734/FZJ-2023-02793
  • ISSN: 2643-1564
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  • Beschreibung: We report the magnetization, ac susceptibility, and specific heat of optically float-zoned single crystals of CePdAl3. In comparison to the properties of polycrystalline CePdAl3 reported in the literature, which displays a tetragonal crystal structure and no long-range magnetic order, our single crystals exhibit an orthorhombic structure (Cmcm) and antiferromagnetic order below a Néel temperature T1=5.6 K. The specific heat at zero field shows two anomalies, namely, a broad transition at T1=5.6 K followed by a λ-anomaly at T2=5.4 K. A conservative estimate of the Sommerfeld coefficient of the electronic specific heat, γ=121mJK−2mol−1, indicates a moderately enhanced heavy-fermion ground state. A twin microstructure evolves in the family of planes spanned by the basal plane lattice vectors ao and co , with the magnetic hard axis bo common to all twins. The antiferromagnetic state is characterized by a strong ao, co easy-plane magnetic anisotropy where the ao direction is the easy axis in the easy plane. A spin-flop transition induced under magnetic field along the easy directions, results in complex magnetic phase diagrams. Taken together, our results reveal a high sensitivity of the magnetic and electronic properties of CePdAl3 to its structural modifications.
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