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Ising-type Magnetic Anisotropy in CePd2As2

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Ajeesh,  M. O.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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dos Reis,  R. D.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Nicklas,  M.
Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Ajeesh, M. O., Shang, T., Jiang, W. B., Xie, W., dos Reis, R. D., Smidman, M., et al. (2017). Ising-type Magnetic Anisotropy in CePd2As2. Scientific Reports, 7: 7338, pp. 1-6. doi:10.1038/s41598-017-07595-w.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-D793-A
Abstract
We investigated the anisotropic magnetic properties of CePd2As2 by magnetic, thermal and electrical transport studies. X-ray diffraction confirmed the tetragonal ThCr2Si2-type structure and the high-quality of the single crystals. Magnetisation and magnetic susceptibility data taken along the different crystallographic directions evidence a huge crystalline electric field (CEF) induced Ising-type magneto-crystalline anisotropy with a large c-axis moment and a small in-plane moment at low temperature. A detailed CEF analysis based on the magnetic susceptibility data indicates an almost pure vertical bar +/- 5/2 > CEF ground-state doublet with the dominantly vertical bar +/- 3/2 > and the vertical bar +/- 1/2 > doublets at 290 K and 330 K, respectively. At low temperature, we observe a uniaxial antiferromagnetic (AFM) transition at T-N = 14.7 K with the crystallographic c-direction being the magnetic easy-axis. The magnetic entropy gain up to T-N reaches almost R ln 2 indicating localised 4 f-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-polarised phase at mu H-0(c0) = 0.95T, exhibiting a textbook example of a spin-flip transition as anticipated for an Ising-type AFM.