Synthesis and characterization of the heavy-fermion compound CePtAl₄Ge₂

Journal Article · 18 December 2017 · Journal of Alloys and Compounds

DOI: https://doi.org/10.1016/j.jallcom.2017.12.180 · OSTI ID:1415422

Shin, Soohyeon  ^[1]; Rosa, Priscila Ferrari Silveira  ^[2]; Ronning, Filip  ^[2]; Thompson, Joe David  ^[2]; Scott, Brian Lindley  ^[2]; Lee, Sangyun ^[1]; Jang, Harim ^[1]; Jung, Soon -Gil ^[1]; Yun, Eunbhin ^[1]; Lee, Hyoyoung ^[1]; Bauer, Eric Dietzgen  ^[2]; Park, Tuson ^[1]

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1. Sungkyunkwan Univ., Suwon (South Korea)
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, we report the synthesis of the Ce-based quaternary compound CePtAl₄Ge₂ that crystallizes in the trigonal structure (space group R 3¯m, 166) with unit cell parameters, a = 4.1995(5) Å, c = 31.851(7) Å, and γ = 120°. Powder X-ray diffraction and energy dispersive X-ray spectroscopy show that CePtAl₄Ge₂ (LaPtAl₄Ge₂) is in a single, homogeneous phase. Magnetic susceptibility, electrical resistivity, and heat capacity measurements of CePtAl₄Ge₂ show that it exhibits antiferromagnetic behavior below 2.3 K. The magnetic susceptibility for the magnetic field applied perpendicular (χ_ab) and parallel (χ_c) to the crystalline c-axis is very anisotropic, and the susceptibility ratio (χ_ab/χ_c) reaches a maximum value of 10, indicating that the spin easy axis is within the Ce plane. The entropy recovered at T_N is consistent with the doublet ground state of the crystal field split J = 5/2 multiplet of Ce³⁺ ions.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: AC52-06NA25396
• OSTI ID: 1415422
• Report Number(s): LA-UR-17-28376; TRN: US1800815
• Journal Information: Journal of Alloys and Compounds, Vol. 738, Issue C; ISSN 0925-8388
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English