Physical properties of the layered $f$-electron van der Waals magnet Ce${}_2$Te${}_5$

Abstract

We report a detailed study of the magnetic, transport, and thermodynamic properties of Ce${}_2$Te${}_5$ single crystals, a layered $f$-electron van der Waals magnet. Four consecutive transitions at $\sim$ 5.2, 2.1, 0.9, and 0.4 K were observed in the $ac$-plane electrical resistivity $\rho$(T), which were further confirmed in specific heat $C_{\text{p}}$(T) measurements. Analysis of the magnetic susceptibility $\chi$(T), the magnetic-field variation of $\rho$(T), and the increase of the first transition temperature ($T_{\text{c}}\sim$ 5.2 K) with applied magnetic field indicates ferromagnetic order, while the decrease of the other transitions with field suggests different states with dominant antiferromagnetic interactions below $T_2\sim$ 2.1 K, $T_3\sim$ 0.9 K, and $T_4$ = 0.4 K. Critical behavior analysis around $T_{\text{c}}$ that gives critical exponents $\beta =0.31(2)$, $\gamma =0.99(2)$, $\delta =4.46(1)$, $T_{\text{c}}=5.32(1)$ K indicates that Ce${}_2$Te${}_5$ shows a three-dimensional magnetic critical behavior. Moreover, the Hall resistivity ${\rho }_{\text{xy}}$ indicates that Ce${}_2$Te${}_5$ is a multi-band system with a relatively high electron mobility $\sim 2900$ cm${}^2$ V${}^{-1}$ s${}^{-1}$ near $T_{\text{c}}$, providing further opportunities for future device applications.

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