Shubnikov-de Haas Effect Study of Cylindrical Fermi Surfaces in UP_2 : Condensed Matter: Electronic Properties, etc.

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Shubnikov-de Haas effect (SdH) measurements and complementary electrical resistivity and specific heat measurements were performed on a high-quality whisker single crystal of UP_2. All except one of detected branches exhibit angular dependences clearly indicating the Fermi surfaces (FS) of cylindrical form. The effective cyclotron masses were determined to range from 1.9 to 9.3 m_0, which yields an electronic specific heat coefficient of 25 mJ/K^2-mol. This is in good agreement with 27 mJ/K^2-mol determined directly by the low-temperature specific-heat measurement. As in sister compounds UA_<s_2>, USb_2 and UBi_2, the two-dimensional Fermi surfaces are formed in the flattened magnetic Brillouin zone and the conduction electrons are confined mainly in the U planes. Significant contribution of itinerant 5f electrons to the conduction band is concluded from rather big effective cyclotron masses.
社団法人日本物理学会の論文
2001-01-15