Incommensurate antiferromagnetic order in CePtAl${}_3$

Abstract

We report a neutron diffraction study of single-crystal CePtAl${}_3$ complemented by measurements of the specific heat under applied magnetic field. Below $T_{\mathrm{N}}$=3 K CePtAl${}_3$ develops incommensurate antiferromagnetic order with a single modulation vector $\vec{k}$=$(0.67600)$. Residual magnetic scattering intensity above $T_{\mathrm{N}}$ and a broadening of the specific heat anomaly at $T_{\mathrm{N}}$ may be consistently described in terms of a Gaussian distribution of transition temperatures with a standard deviation $\sigma \approx 0.5\mathrm{K}$. The distribution of $T_{\mathrm{N}}$ may be attributed to the observation of occupational and positional disorder between the Pt and Al sites. Measurements under magnetic field reveal unusual changes of the domain populations when the field is applied along the $[010]$ direction consistent with a transition from cycloidal to amplitude modulated magnetic order around 2.5 T.

arXiv commentv1: Draft on CePtAl3 and CePdAl3. Later split into separate papers regarding each compound separately. v2: Before submission. Major reworks from v1. v3: Final. After peer review and proofs

References in corpus (10)

• Mantid - Data Analysis and Visualization Package for Neutron Scattering and $\mu SR$ Experiments
• Superconducting phases of f-electron compounds
• Topological Magnetic Phase in the Candidate Weyl Semimetal CeAlGe
• Itinerant vs Localized Heavy-Electron Magnetism
• Magnetoelastic hybrid excitations in CeAuAl${}_3$
• Muon spin rotation and neutron scattering study of the non-centrosymmetric tetragonal compound CeAuAl3
• Single crystal growth of CeTAl${}_3$ (T = Cu, Ag, Au, Pd and Pt)
• Ultra-high vacuum compatible preparation chain for intermetallic compounds
• XYZ-polarisation analysis of diffuse magnetic neutron scattering from single crystals
• Magnetic properties of the noncentrosymmetric tetragonal antiferromagnet EuPtSi${}_3$

Cited by in corpus (1)

• Long-range magnetic order in CePdAl${}_3$ enabled by orthorhombic deformation