Quadrupolar Phase Diagram and Fermi Surface Properties in the Localized 5f^2-Electron System UPd_3 : Condensed Matter: Electronic Properties, etc.

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We measured the electrical resistivity, specific heat, magnetostriction, magnetization and de Haas-van Alphen (dHvA) oscillation in UPd_3 with the hexagonal structure in order to clarify the quadrupolar and magnetic properties as well as the nature of conduction electrons. The high-field magnetization measurement at 4.2 K in magnetic fields up to about 50 T reveals two-successive metamagnetic transitions at 10.2 and 17.9 T for the field along the [0001] direction, and one transition at 27.6T along [1120]. From the results of magnetization as well as the magnetostriction measurements at various temperatures, we determined the magnetic phase diagram. Phase boundaries are discussed on the basis of the crystalline electric field scheme of the 5f^2 configuration and the quadrupolar interaction of O.*. Reflecting the localized 5f-electrons, the conduction electrons have small cyclotron effective masses ranging from 0.24 to 3.62 m_0, which were determined by the dHvA experiment. The dHvA data are compared to the result of band calculations based on the 5f^2-localized band model.
社団法人日本物理学会の論文
2001-06-15