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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ce2Te5 by Materials Project

Ce2Te5 crystallizes in the orthorhombic Cmcm space group. The structure is two-dimensional and consists of two Ce2Te5 sheets oriented in the (0, 1, 0) direction. there are two inequivalent Ce4+ sites. In the first Ce4+ site, Ce4+ is bonded in a 9-coordinate geometry to nine Te+1.60- atoms. There are a spread of Ce–Te bond distances ranging from 3.24–3.33 Å. In the second Ce4+ site, Ce4+ is bonded in a 9-coordinate geometry to nine Te+1.60- atoms. There are five shorter (3.24 Å) and four longer (3.32 Å) Ce–Te bond lengths. There are five inequivalent Te+1.60- sites. In the first Te+1.60- site, Te+1.60- is bonded in a 2-coordinate geometry to two equivalent Ce4+ and four equivalent Te+1.60- atoms. All Te–Te bond lengths are 3.12 Å. In the second Te+1.60- site, Te+1.60- is bonded in a 2-coordinate geometry to two equivalent Ce4+ and four equivalent Te+1.60- atoms. In the third Te+1.60- site, Te+1.60- is bonded in a 8-coordinate geometry to four equivalent Ce4+ and four equivalent Te+1.60- atoms. All Te–Te bond lengths are 3.12 Å. In the fourth Te+1.60- site, Te+1.60- is bonded to five Ce4+ atoms to form a mixture of distorted corner and edge-sharing TeCe5 trigonal bipyramids. In the fifth Te+1.60- site, Te+1.60- is bonded to five Ce4+ atoms to form a mixture of distorted corner and edge-sharing TeCe5 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Physical properties of the layered $\mathcal{f}$-electron van der Waals magnet Ce 2 Te 5

Here. we report a detailed study of the magnetic, transport, and thermodynamic properties of Ce 2 Te 5 single crystals, a layered $\mathcal{f}$-electron van der Waals magnet. Four consecutive transitions at ~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 ($T_c$ ~ 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 $T_2$ ~ 2.1 K, $T_3$ ~ 0.9 K, and $T_4$ = 0.4 K. Critical behavior analysis around Tc that gives critical exponents $\beta$ = 0.31(2), $\gamma$ = 0.99(2), $\delta$ = 4.46(1), and $T_c$ = 5.32(1) K indicates that Ce 2 Te 5 shows a three-dimensional magnetic critical behavior. Moreover, the Hall resistivity ρxy indicates that Ce2Te5 is a multiband system with a relatively high electron mobility ~2900 cm 2 V –1 s –1 near $T_c$, providing further opportunities for future device applications.

36 MATERIALS SCIENCE↗