Magnetic properties of the noncentrosymmetric tetragonal antiferromagnet EuPtSi${}_3$

Abstract

We report a comprehensive study of single crystals of the noncentrosymmetric rare-earth compound EuPtSi${}_3$ grown by the optical floating-zone technique. Measurements of the magnetization, ac susceptibility, and specific heat consistently establish antiferromagnetic order of localized Eu${}^{2+}$ moments below the Néel temperature $T_{\mathrm{N}}=17\mathrm{K}$, followed by a second magnetic transition at $T_{N1}=16\mathrm{K}$. For a magnetic field along the easy $[001]$ axis, the magnetic phase diagram is composed of these two phases. For fields applied in the magnetically hard basal plane, two additional phases emerge under magnetic field, where the in-plane anisotropy is weak with $[100]$ being the hardest axis. At the phase transitions, the magnetic properties exhibit hysteresis and discrepancies between differential and ac susceptibility, suggesting slow reorientation processes of mesoscale magnetic textures. Consistently, powder and single-crystal neutron diffraction in zero field identify magnetic textures that are modulated on a length scale of the order of $100\text{A˚}$, most likely in the form of Néel-type antiferromagnetic cycloids.

15 pages, 12 figures

References in corpus (7)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• A new class of chiral materials hosting magnetic skyrmions beyond room temperature
• Magnetic phase diagram of MnSi inferred from magnetization and ac susceptibility
• Symmetry breaking, slow relaxation dynamics, and topological defects at the field-induced helix reorientation in MnSi
• Ultra-high vacuum compatible preparation chain for intermetallic compounds
• Ultra-high vacuum compatible induction-heated rod casting furnace

Cited by in corpus (4)

• Resonant elastic X-ray scattering of antiferromagnetic superstructures in EuPtSi${}_3$
• Incommensurate antiferromagnetic order in CePtAl${}_3$
• Pressure evolution of electronic and crystal structure of non-centrosymmetric EuCoGe${}_3$
• Magnetic Properties of YbBe13 Probed by Neutron Scattering and Thermodynamic Measurements