2018 Fiscal Year Final Research Report
Theoretical study of lattice-distortion effects on the spin ordering in frustrated magnets
| Project/Area Number |
16K17748
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | Osaka University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2016-04-01 – 2019-03-31
|
| Keywords | フラストレート磁性体 / スピン-格子カップリング / パイロクロア格子 |
|---|
| Outline of Final Research Achievements |
In frustrated magnets, spins residing on a lattice cannot settle in a stable structure down to low temperatures due to complex competitions between magnetic interactions. In such a situation, it often happens that spins are coupled to the lattice degrees of freedom and the underlying lattice is distorted spontaneously to resolve the magnetic frustration, leading to a magnetic long-range order. In this work, bearing spinel chromium oxides in our mind, we theoretically investigate lattice-distortion effects in antiferromagnets on pyrochlore lattices. It is found by means of numerical simulations that local lattice-distortions play an important role in this class of antiferromagnets.
|
| Free Research Field |
物性理論
|
| Academic Significance and Societal Importance of the Research Achievements |
物質を構成する電子は電荷とスピンの２つの自由度をもち、それぞれ物質の電気的性質、磁気的性質を担っている。通常、金属では電荷が、磁性体ではスピンが主役となる。一方、マルチフェロのような電気と磁気が相関する機能性物質では、固体中の電子軌道や結晶格子など電荷に関わる自由度とスピン自由度の結合が重要である。フラストレート磁性体と呼ばれる結晶格子上のスピン間に複雑な相互作用が働く磁性体におけるスピン-格子結合の効果を取り扱った本研究の成果は、機能性物質をはじめ、トポロジカル絶縁体や超伝導体などスピン自由度と電気的自由度の結合が重要となる様々な物質群の研究に新たな知見をもたらすものである。
|
