Physical properties of CeIrSi with trillium-lattice frustrated magnetism

Abstract

Magnetic (χ), transport (ρ) and heat capacity (Cm) 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 ≈ 2.46µB, this Ce-lattice compound does not undergo a magnetic transition. In spite of that it shows broad Cm(T )/T and χ(T ) maxima centered at Tmax ≈ 1.5 K, while a ρ ∝ T 2 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 ∝ T 2 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.

Geometric Frustration on the Trillium Lattice in a Magnetic Metal-Organic Framework

“…Remarkably few magnets are known to adopt this lattice, but those that do-mostly intermetallics-exhibit a wide range of interesting physics. In MnSi, for example, magnetic skyrmions arise from competition between ferromagnetism and the Dzyalloshinskii-Moriya interaction [14,15]; EuPtSi and EuPtGe are strongly-correlated spin liquids [16]; and CeIrSi is an Ising trillium spin-ice candidate [17,18]. Theory tells us that even the simple nearest-neighbour Heisenberg antiferromagnet (nnHAF) on this lattice should support a classical spin-liquid (CSL) phase over a wide temperature range [13], with 120 • helical order ("Y" phase; k ord = [ 1 3 , 0, 0]) in the frustrated magnetic ground state [19].…”

Geometric frustration on the trillium lattice in a magnetic metal-organic framework

“…of interesting physics. In MnSi, for example, magnetic skyrmions arise from competition between ferromagnetism and the Dzyalloshinskii-Moriya interaction [18,19]; EuPtSi and EuPtGe are strongly-correlated spin liquids [20]; and CeIrSi is an Ising trillium spin-ice candidate [23,24]. Theory tells us that even the simple nearest-neighbour Heisenberg antiferromagnet (nnHAF) on this lattice should support a classical spin-liquid (CSL) phase over a wide temperature range [17].…”