SOLID STATE PROPERTY OF HIGHLY CORRELATED CONDUCTING SYSTEMS

我们已经取得了巨大的进步，在anisotropic superconductivity of the heavy electron systems . When Wecompare the phonon-mediated attractive interaction to the强烈反应interaction among thequasiparticles with an f-electron character，这是他们的差异，因为前一个latter one. to avoid a large overlap ofwave functions of the paired particlesheavy electron system would rather choose an anisotropic channellike a p-wave spin triplet or a d-wave spin singlet stateto form Cooper pairs.我们已经持续在studying non-BCS superconductivity of uranium compounds，and have clarified spin-triplet (p-or f-wave) superconductivity in UPt D23 - D2 from the NMR-Knightshift experiment and also observed a magnetic exci-tation gap associated with d-wavesuperconductivity of UPd - 22 - D2Al - D23 - D2.We have observed the de Haas-van Alphen oscillation inthe normal and superconducting mixed states of CeRu - D22 - D2 and URu - D22 - D2Si - D22 - D2. thequsiparticle scattering in the mixed state is discussed on the basis of the Maki theory.Anotherprogress been also made in quadrupolar compounds. Antiferroquadrupolar ordering of CeB D26 D2，where the experimental analyses inconsistent，这是明确的主题由considering dipole，quadrupole and octupole in magnetic fields. The metamagnetic transition of PrCu - D22 - D2 bringsabout an interchange between the easy and hard axes' directions of the magnetization. Thisinteresting phenomenon is explained on the basis of the quadrupolar interaction. Furthermore，precise experiments have been done for antiferroquadrupolar com-pounds of PrPb D23 D2，TmTe and Ce D23 D2Pd D220 D2Ge D26 D2.In addition to these experimentsmany experimental results have been obtained for metamagnetism of heavy electron systemsKondo insulators and non-Fermi liquid effect。

We have made big progress in anisotropic superconductivity of the heavy electron systems . When we compare the phonon-mediated attractive interaction to the strong repulsive interaction among the quasiparticles with an f-electron character, it is theoretically difficult for the former to overcome the latter one. To avoid a large overlap of the wave functions of the paired particles, the heavy electron system would rather choose an anisotropic channel, like a p-wave spin triplet or a d-wave spin singlet state, to form Cooper pairs. We have continued in studying non-BCS superconductivity of uranium compounds, and have clarified spin-triplet (p-or f-wave) superconductivity in UPtィイD23ィエD2 from the NMR-Knight shift experiment and also observed a magnetic exci-tation gap associated with d-wave superconductivity of UPdィイD22ィエD2AlィイD23ィエD2.We have observed the de Haas-van Alphen oscillation in the normal and superconducting mixed states of CeRuィイD22ィエD2 and URuィイD22ィエD2SiィイD22ィエD2. The qusiparticle scattering in the mixed state is discussed on the basis of the Maki theory.Another progress has been also made in quadrupolar compounds. Antiferroquadrupolar ordering of CeBィイD26ィエD2, where the experimental analyses were inconsistent, is clarified theoretically by considering dipole, quadrupole and octupole in magnetic fields. The metamagnetic transition of PrCuィイD22ィエD2 brings about an interchange between the easy and hard axes' directions of the magnetization. This interesting phenomenon is explained on the basis of the quadrupolar interaction. Furthermore, precise experiments have been done for antiferroquadrupolar com-pounds of PrPbィイD23ィエD2, TmTe and CeィイD23ィエD2PdィイD220ィエD2GeィイD26ィエD2.In addition to these experiments, many experimental results have been obtained for metamagnetism of heavy electron systems, Kondo insulators and non-Fermi liquid effect.