Local correlation and nontrivial orders in f-electron systems

2016 Fiscal Year Final Research Report

• Project/Area Number: 24340072
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: High Energy Accelerator Research Organization (2016); Tohoku University (2012-2015)
• Principal Investigator: KURAMOTO Yoshio 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 特別教授 (70111250)
• Project Period (FY): 2012-04-01 – 2017-03-31
• Keywords: 近藤格子 / 非クラマース系 / 複合体秩序 / 軌道近藤効果 / 電荷近藤効果 / 奇数波超伝導 / 量子モンテカルロ法 / 動的平均場理論

Outline of Final Research Achievements

As the primary result of the project, we have demonstrated the new form of electronic orders which involve both conduction and localized f electrons. The composite order appears typically as an itinerant multipole order, or an exotic superconducting order with odd frequency pairing. Secondly, we have shown for the Kondo lattice that the quantum critical point of antiferromagnetism preserves the itinerant nature of heavy electrons. The localized character sets in at another transition within the antiferromagnetic phase. This conclusion is in good agreement with accurate experimental results for some Ce compounds. Thirdly, we have clarified the condition for decrease of the characteristic energy for valence fluctuations by the Coulomb repulsion with conduction electrons. This mechanism is a candidate for emegence of heavy electrons that are insensitive to magnetic fields.

Free Research Field

物性理論