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F. Kneidinger, I. Zeiringer, A. Sidorenko, E. Bauer, H. Michor, P. Rogl, J.G. Sereni:
"Physical properties of CeIrSi with trillium-lattice frustrated magnetism";
Physical Review B, 100 (2019), 134442-1 - 134442-7.

Magnetic (χ), transport (ρ), and heat capacity (C_m) properties of CeIrSi are investigated to elucidate the effect of geometric frustration in this compound with trillium type structure because, notwithstanding its robust effective moment, μ_eff ≈ 2.46 μ_B, this Ce-lattice compound does not undergo a magnetic transition. In spite of that it shows broad C_m(T)/T and χ(T) maxima centered at T_max ≈ 1.5 K, while a ρ ∝ T² thermal dependence, characteristic of electronic spin coherent fluctuations, is observed below T_coh ≈ 2.5 K. Magnetic field does not affect significantly the position of the mentioned maxima up to ≈1 T, though χ(T) shows an incipient structure that completely vanishes at μ₀H ≈ 1 T. Concerning the ρ ∝ T² dependence, it is practically not affected by magnetic field up to μ₀H = 9 T, with the residual resistivity ρ₀(H) slightly decreasing and T_coh(H) increasing. These results are compared with the physical properties observed in other frustrated intermetallic compounds.

magnetic frustration, trillium lattice, entropy

http://dx.doi.org/10.1103/PhysRevB.100.134442