2022 Fiscal Year Final Research Report
Study of electronic states and valence/magnetic critical states unique to strongly correlated electron quasicrystals
Project/Area Number |
18H01174
|
Research Category |
Grant-in-Aid for Scientific Research (B)
|
Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
|
Research Institution | Nagoya University |
Principal Investigator |
|
Project Period (FY) |
2018-04-01 – 2022-03-31
|
Keywords | 強相関電子系 / 低温物性 / 磁性 / 超伝導 / 準結晶 / 近似結晶 / 量子臨界現象 |
Outline of Final Research Achievements |
(1) Au-Al-Yb quasicrystals and approximants are located at a point where the average Yb valence steeply changes. We have found that valence fluctuations, which originate from spin and charge transfer fluctuations, play an important role in quantum critical phenomena in Au-Al-Yb quasicrystals and approximants. (2) From the view point of chemical pressure, at a small lattice constant (high pressure side), the average Yb valence approaches trivalent state and magnetism appears. On the other hand, magnetism is suppressed at a large lattice constant (low voltage side), but superconductivity appears.
|
Free Research Field |
低温物理・超伝導・磁性
|
Academic Significance and Societal Importance of the Research Achievements |
固体物理学の教科書の初めで前提とする周期的並進対称性が無く、特殊な並進対称性(準周期性)をもつ準結晶に焦点を当てた基礎研究であるため基礎物理学・最先端の物理学への波及効果は大きく、各論ではなく普遍的な学問体系に寄与する。並進対称性(周期性・準周期性)とクラスター構造(局所構造)に着目した新しい物質系の開発は新奇な状態を発現させる新機能物質開発につながる可能性がある。
|