Evolution of Fermi Surface Properties in Ce_xLa_<1-x>B_6 and Pr_xLa_<1-x>B_6(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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We report the de Haas-van Alphen (dHvA) effect measurements of the Fermi surface properties in LaB_6, Ce_xLa_<1-x>B_6 (x=0.1, 0.25, 0.5, 0.75, 1.0) and Pr_xLa_<1-x>B_6 (x=0.25, 0.5, 0.75, 1.0) with particular attention to the spin dependence of the Fermi surface properties. The Fermi surface shape and dimension of Ce_xLa<1-x>B_6 change considerably with Ce concentration, while those of Pr_xLa<1-x>B_6 change very slightly up to x=0.75, and in PrB_6 the Fermi surface splits into the up and down spin Fermi surfaces. The effective mass of Ce_xLa_<1-x>B_6 increases considerably with Ce concentration and is nearly proportional to the number of Ce ions, whereas that of Pr_xLa<1-x>B_6 increases slightly with Pr concentration. In Ce_xLa_<1-x>B_6 the effective mass depends very strongly on field and increases divergently with decreasing field, while that of Pr_xLa<1-x>B_6 increases slightly with decreasing field. The contribution to the dHvA signal from the conduction electrons of one spin direction diminishes with Ce concentration and appears to disappear somewhere around x=0.25-0.5. A weak spin dependence is also found in Pr_xLa_<1-x>B_6. The behaviors of Ce_xLa<1-x>B_6 and Pr_xLa<1-x>B_6 are compared to discuss the origin of the spin dependence of the Fermi surface properties.
社団法人日本物理学会の論文
2006-11-15