Metamagnetic crossover in the quasikagome Ising Kondo-lattice compound CeIrSn

摘要: The Ce atoms in CeIrSn form a quasikagome lattice the hexagonal $c$ plane. Our single-crystal x-ray diffraction analysis has confirmed absence of superstructure ZrNiAl-type structure. Motivated by recent observation quantum critical behaviors isostructural and isoelectronic compound CeRhSn, we have studied low-temperature properties single-crystalline samples measuring electrical resistivity, magnetic susceptibility $\ensuremath{\chi}$, magnetization $M$, specific heat $C$ down to 0.05 K. study does not show evidence long-range ordering lowest temperature. $\ensuremath{\chi}(T)$ data an Ising character, ${\ensuremath{\chi}}_{c}\ensuremath{\gg}{\ensuremath{\chi}}_{a}$, power-law at low temperatures: ${\ensuremath{\chi}}_{c}\ensuremath{\propto}{T}^{\ensuremath{-}0.8}$ ${\ensuremath{\chi}}_{a}\ensuremath{\propto}{T}^{\ensuremath{-}0.6}$. When external field $B$ is applied along $a$ axis, both $M(B)$ $C(B)/T$ exhibit metamagnetic anomalies 5.5 T, which resemble those observed CeRhSn 3.5 T. We attribute crossover under in-plane fields alleviation frustration inherent Kondo lattice.