Investigation of the physical properties of the tetragonal CeMAl₄Si₂ (M = Rh, Ir, Pt) compounds

Journal Article · Mon Dec 15 00:00:00 EST 2014 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/0953-8984/27/2/025601· OSTI ID:1233168

Ghimire, N. J. ^[1]; Ronning, F. ^[1]; Williams, D. J. ^[1]; Scott, B. L. ^[1]; Luo, Yongkang ^[1]; Thompson, J. D. ^[1]; Bauer, E. D. ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The synthesis, crystal structure and physical properties studied by means of x-ray diffraction, magnetic, thermal and transport measurements of CeMAl₄Si₂ (M = Rh, Ir, Pt) are reported, along with the electronic structure calculations for LaMAl₄Si₂ (M = Rh, Ir, Pt). These materials adopt a tetragonal crystal structure (space group P4/mmm) comprised of BaAl₄ blocks, separated by MAl₂ units, stacked along the c-axis. Both CeRhAl₄Si₂ and CeIrAl₄Si₂ order antiferromagnetically below T_N1 = 14 and 16 K, respectively, and undergo a second antiferromagnetic transitition at lower temperature (T_N2 = 9 and 14 K, respectively). CePtAl₄Si₂ orders ferromagnetically below T_C = 3 K with an ordered moment of μ_sat = 0.8 μ_B for a magnetic field applied perpendicular to the c-axis. Electronic structure calculations reveal quasi-2D character of the Fermi surface.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-06NA25396
• OSTI ID: 1233168
• Report Number(s): LA-UR-14-28005
• Journal Information: Journal of Physics. Condensed Matter, Vol. 27, Issue 2; ISSN 0953-8984
• Publisher: IOP Publishing
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Ce-based intermetallic compounds
heavy-fermions
electronic-anisotrophy