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What's New
- Add one topic on our Highlights.
- Add REIMEI Workshop Information and Updates of Publications (FY2014).
- Updates of Publications (FY2014).
- Add "REIMEI Workshop Program on Jun. 23, 2014" and "Photo Album"
- Updates of Highlights, Publications. Changes of Site Design. (May 22, 2014)
- Photo album page of the 1st ASRC International Workshop.
Foundation of New Concept in condensed matter physics for heavy element systems
In heavy element (f-electron) systems, valence fluctuations, the Kondo effect, and the RKKY interaction (see Note in the last of this page) compete with one another. Because of this, exotic behaviors such as quantum critical points, heavy fermions, non-Fermi liquids, anisotropic superconductivity and multipolar ordering appear when such competition is strong. Recently, it has become clear that these exotic behaviors for 5f-electron systems are different from those for 4f-electrons. This is because electrons with different spin and orbital character can coexist in 5f actinide systems, in contrast to the case of 4f electrons. In the present study, we try to clarify these exotic behaviors due to the “many-fold” character of 5f actinide compounds, including transuranium. 5f-electron systems are regarded to posses properties intermediate between those of 3d and 4f-electrons systems. The final scientific goal of our project is to unify the concept of magnetism and superconductivity for 3d through 5f systems.
The NMR spectrometers at Advanced Science Research Center (ASRC) enable measurements of exotic behaviors under extreme environments (e.g. high magnetic field, high pressure, and high radioactivity). Moreover, a new μSR spectrometer for this group will be developed and operated at J-PARC. We also collaborate with the materials group and the solid state theory group, which is highly effective for the progress of our research.
In heavy element (f-electron) systems, valence fluctuations, the Kondo effect, and the RKKY interaction (see Note in the last of this page) compete with one another. Because of this, exotic behaviors such as quantum critical points, heavy fermions, non-Fermi liquids, anisotropic superconductivity and multipolar ordering appear when such competition is strong. Recently, it has become clear that these exotic behaviors for 5f-electron systems are different from those for 4f-electrons. This is because electrons with different spin and orbital character can coexist in 5f actinide systems, in contrast to the case of 4f electrons. In the present study, we try to clarify these exotic behaviors due to the “many-fold” character of 5f actinide compounds, including transuranium. 5f-electron systems are regarded to posses properties intermediate between those of 3d and 4f-electrons systems. The final scientific goal of our project is to unify the concept of magnetism and superconductivity for 3d through 5f systems.
The NMR spectrometers at Advanced Science Research Center (ASRC) enable measurements of exotic behaviors under extreme environments (e.g. high magnetic field, high pressure, and high radioactivity). Moreover, a new μSR spectrometer for this group will be developed and operated at J-PARC. We also collaborate with the materials group and the solid state theory group, which is highly effective for the progress of our research.
We are promoting vigorously international joint-researches with TRIUMF (CANADA), PSI (Switzerland), Columbia Univ. (USA), LANL (USA), ITU (Germany), CEA and ILL (France). We are also promoting collaborations with the other branches of JAEA, Tohoku Univ. and Osaka Univ. Especially, for the trans-uranium project, we are working under strong relationship with Oarai-branch of IMR-Tohoku Univ.
(Note) "RKKY interaction" means an exchange interaction between local f -moments via spins of conduction electrons. This interaction is lead by M.A.Ruderman, C.Kitte, T.Kasuya, and K.Yoshida.
(Note) "RKKY interaction" means an exchange interaction between local f -moments via spins of conduction electrons. This interaction is lead by M.A.Ruderman, C.Kitte, T.Kasuya, and K.Yoshida.
