Fermi surface and magnetic properties ofCeTe

Abstract

We have grown high quality single crystals of the Kondo compound $\mathrm{CeTe}$ and its reference compounds $\mathrm{La}{\mathrm{X}}_{\mathrm{c}}$'s with ${\mathrm{X}}_{c}=\mathrm{S},\mathrm{Se},\mathrm{Te}$, and measured the de Haas-van Alphen effect of these compounds and the magnetic properties of $\mathrm{CeTe}$. The Fermi surface of each $\mathrm{La}{\mathrm{X}}_{c}$ is centered at the $\mathrm{X}$ points of the Brillouin zone and has a nearly ellipsoidal shape. The cyclotron effective masses are very close to the electron rest mass. On the other hand, $\mathrm{CeTe}$ has a rather complicated magnetic phase diagram which is different from that predicted by previous works. In the induced ferromagnetic phase of $\mathrm{CeTe}$, the Fermi surface is found to be similar to that of $\mathrm{LaTe}$ but it splits into the majority and minority spin Fermi surface due to the exchange interaction between the $4f$ and conduction electrons. We have also observed strongly enhanced cyclotron effective masses in that phase. Interestingly, the mass enhancement of the minority spin surface differs with that of the majority spin surface by about a factor of 2.