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

Abstract

The synthesis, crystal structure, and physical properties studied by means of x-ray diffraction, magnetic, thermal and transport measurements of CeMAl${}_4$Si${}_2$ (M = Rh, Ir, Pt) are reported, along with the electronic structure calculations for LaMAl${}_4$Si${}_2$ (M = Rh, Ir, Pt). These materials adopt a tetragonal crystal structure (space group P4/mmm) comprised of BaAl${}_4$ blocks, separated by MAl${}_2$ units, stacked along the $c$-axis. Both CeRhAl${}_4$Si${}_2$ and CeIrAl${}_4$Si${}_2$ 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). CePtAl${}_4$Si${}_2$ orders ferromagnetically below $T_C$ =3 K with an ordered moment of ${\mu }_{sat}$=0.8 ${\mu }_B$ for a magnetic field applied perpendicular to the $c$-axis. Electronic structure calculations reveal quasi-2D character of the Fermi surface.

References in corpus (1)

• Fermi-liquid instabilities at magnetic quantum phase transitions

Cited by in corpus (2)

• Reentrant phase transitions of a coupled spin-electron model on doubly decorated planar lattices with two or three consecutive critical points
• Nuclear magnetic resonance investigation of the heavy fermion system Ce${}_2$CoAl${}_7$Ge${}_4$