Theoretical Study on Diversity of Mechnism of Supercondcutivity in Strongly Correlated Electron Systems

2016 Fiscal Year Final Research Report

• Project/Area Number: 25400369
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Toyota Physical and Chemical Research Institute
• Principal Investigator: Miyake Kazumasa 公益財団法人豊田理化学研究所, フェロー事業部門, フェロー (90109265)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 量子臨界価数転移 / 原子価スキッピング / 電荷移動ゆらぎ超伝導機構 / スピンゆらぎ超伝導機構 / 重い電子系 / スピン３重項超伝導 / カイラル超伝導 / ２チャンネルアンダーソン格子モデル

Outline of Final Research Achievements

The physics of quantum critical valence transition, closely related with the mechanism of superconductivity around there, offers the origin of unconventional quantum criticality which is rather ubiquitously observed in a series of compounds including Yb-based quasicrystal system. We succeeded in constructing the theory that explains these anomalous properties in a coherent way.
The unconventional non-Fermi liquid properties observed in a series of Pr-1-2-20 systems was explained in a coherent way on the basis of the two-channel periodic Anderson model which takes into account the quadrupole degrees of freedom of Pr+3 ion.
In Equal-Spin-Pairing superconducting state, the spin polarization was shown to be induced spontaneously if the energy dependence of the density of states near the Fermi level is taken into account properly.

Free Research Field

物性理論