Experimental verification of novel quantum liquid crystal states in spin dimer magnets

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K03834
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: University of Fukui
• Principal Investigator: KIkuchi Hikomitsu 福井大学, 遠赤外領域開発研究センター, 教授 (50234191)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 磁気的性質 / 量子液晶 / スピンフラストレーション

Outline of Final Research Achievements

In order to experimentally clarify the magnetic properties of the S=1 spin dimer compound Cs3V2Cl9, which is expected to be a quantum liquid crystal state, we synthesized high quality single crystals and measured their magnetic susceptibility, magnetization, 133Cs-NMR, μSR. We also prepared samples of Cs3V2Cl9 doped with a small amount of non-magnetic impurities and investigated the effect of impurity doping on the magnetic ordering properties. We found that the magnetism of Cs3V2Cl9 cannot be explained by the isolated dimer model as considered so far, and a new model scheme is needed, and that the phase transition at high temperatures is difficult to explain by conventional magnetic ordering.

Free Research Field

磁性

Academic Significance and Societal Importance of the Research Achievements

量子液晶研究は、基礎分野のみならず、将来の量子力学応用技術においても重要な最先端研究分野であり、今後ますます広い領域に広がっていくと考えられる。Cs3V2Cl9の基底状態が理論的に予想されている量子液晶状態である可能性を示唆する結果を得た。また、Cs3V2Cl9を構成するS=1ダイマーが三角格子を形成することから、量子液晶状態とスピンフラストレーションとのシナジー効果によって新しい相転移が生じる可能性を指摘した。これらの成果は学術的に意義があると考えられる。