NMR studies of exotic electronic states in Pr based compounds with non Kramers doublet crystal electric field ground state

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400359
• 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: Kobe University
• Principal Investigator: TOU Hideki 神戸大学, 理学研究科, 教授 (60295467)
• Research Collaborator: KUBO Tetsuro 神戸大 ; MATSUNO Haruki 神戸大 ; KISHIMOTO Yasuki 神戸大 ; AOYAMA Taisuke 神戸大 ; MIYAKE Ryoma 神戸大 ; NAKASE Jin 神戸大 ; HIGASHINAKA Ryuji 首都大学東京 ; AOKI Yuji 首都大学東京 ; SASAKI Takahiko 東北大金研 ; HARIMA Hisatomo 神戸大
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 多極子 / 結晶場 / 核磁気共鳴 / 強相関電子 / 非フェルミ流体 / 混成効果

Outline of Final Research Achievements

We have carried out nuclear magnetic resonance measurements on PrT2Al20 that exhibits various ground states, such as, superconductivity, quadrupole order, and non-Fermi liquid state, etc. The present studies evidence that the crystal electric field (CEF) state is composed of the non-magnetic doublet CEF ground and the magnetic triplet CEF 1st excited states. Temperature dependence of the NMR relaxation rate of PrNb2Al20 clearly shows that the characteristic temperature for the cf mixing between conduction electron and f-electron states is estimated to be 80 Kelvin. Systematic analyses for other PrT2Al20 strongly suggest that the various ground state properties come from the quasi-quintet CEF state owing to the competition between the cf-mixing and the nonmagnetic doublet CEF ground state.

Free Research Field

強相関電子物性実験