# Physical properties of CeIrSi with trillium-lattice frustrated magnetism

## TL;DR

This study investigates the magnetic, transport, and heat capacity properties of CeIrSi, revealing effects of geometric frustration that prevent magnetic ordering and influence electronic fluctuations, with results consistent across varying magnetic fields.

## Contribution

It provides new insights into how trillium-lattice geometric frustration affects magnetic and electronic properties in CeIrSi, a previously less understood compound.

## Key findings

- CeIrSi does not undergo magnetic transition despite large magnetic moments.
- Broad maxima in heat capacity and susceptibility indicate frustration effects.
- Resistivity shows T^2 dependence, characteristic of electronic spin fluctuations, unaffected by high magnetic fields.

## Abstract

Magnetic ($\chi$), transport ($\rho$) 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, $\mu_{\rm eff}\approx 2.46\mu_B$, this Ce-lattice compound does not undergo a magnetic transition. In spite of that it shows broad $C_m(T)/T$ and $\chi(T)$ maxima centered at $T_{max}\approx 1.5$\,K, while a $\rho \propto T^2$ thermal dependence, characteristic of electronic spin coherent fluctuations, is observed below $T_{coh} \approx 2.5$\,K. Magnetic field does not affect significantly the position of the mentioned maxima up to $\approx 1$\,T, though $\chi(T)$ shows an incipient structure that completely vanishes at $\mu_0 H \approx 1$\,T. Concerning the $\rho \propto T^2$ dependence, it is practically not affected by magnetic field up to $\mu_0 H = 9$\,T, with the residual resistivity $\rho_0(H)$ slightly decreasing and $T_{coh}(H)$ increasing. These results are compared with the physical properties observed in other frustrated intermetallic compounds