We have grown high quality single crystals of the Kondo compound CeTe and its reference compounds LaXc's with Xc=S,Se,Te, and measured the de Haas-van Alphen effect of these compounds and the magnetic properties of CeTe. The Fermi surface of each LaXc is centered at the 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, CeTe has a rather complicated magnetic phase diagram which is different from that predicted by previous works. In the induced ferromagnetic phase of CeTe, the Fermi surface is found to be similar to that of 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.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2004 8|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics