Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Correlated Electrons: f-Electron Systems

TT 60.11: Vortrag

Donnerstag, 23. März 2017, 12:15–12:30, HSZ 201

Ising-type Magnetic Anisotropy in CePd₂As₂ — •M. O. Ajeesh¹, T. Shang², W. B. Jiang², W. Xie², R. D. dos Reis¹, M. Smidman², C. Geibel¹, H. Q. Yuan², and M. Nicklas¹ — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou, China

We studied the magnetic, thermal, and electrical transport properties of CePd₂As₂. X-ray diffraction confirmed the tetragonal ThCr₂Si₂-type structure and the high-quality of the single crystals. Magnetization and magnetic susceptibility data taken along the different crystallographic directions evidence a huge crystal electric field (CEF) induced Ising-type magneto-crystalline anisotropy with a large c-axis moment and a small in-plane moment at low temperature. Accordingly, we observe a uniaxial antiferromagnetic (AFM) ordering at a transition temperature of T_N≈15K with the crystallographic c-direction being the magnetic easy axis. The magnetic entropy gain up to T_N reaches almost Rln2 indicating localized 4f-electron magnetism without significant Kondo-type interactions. Below T_N, the application of a magnetic field along the c-axis induces a metamagnetic transition from the AFM to a field-polarized phase at B_C≈1T, exhibiting a text-book example of a spin-flip transition as anticipated for an Ising-type AFM. A detailed crystal electric field analysis based on the magnetic-susceptibility data indicates an almost pure |± 5/2⟩ CEF ground-state doublet with the dominantly |± 3/2⟩ and the |± 1/2⟩ doublets at 290K and 330K, respectively.