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F. Kneidinger, I. Zeiringer, A. Sidorenko, H. Michor, P. Rogl, J.G. Sereni, E. Bauer:
"Magnetic frustration in the trillium lattice CeIrSi";
Poster: International Conference on Strongly Correlated Electron Systems 2019 (SCES '19), Okayama, Japan; 23.09.2019 - 28.09.2019.

Magnetic (χ), transport (ρ) and heat capacity (C_m) properties of CeIrSi are investigated to elucidate the effect of geometric frustration in this ternary intermetallics with the trillium type structure because, notwithstanding its robust effective moment, μ_eff= 2.46 μ_B, this Ce-lattice compound does not undergo a magnetic order transition. In spite of that it shows broad C_m(T)=T anomaly and a χ(T) maximum centered at T_max~ 1.5 K, while a ρ proportional T² thermal dependence, characteristic of coherent electronic spin fluctuations, is observed below T_coh~2.5 K. Magnetic fields do not significantly affect 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 proportional T² dependence, it is practically not affected by magnetic fields 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 frustartion, trillium lattice, CeIrSi