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Antiferromagnetic ordering and estimation of the exchange interaction in the π-d system λ-(BEDSe-TTF)2FeCl4 studied using 13C NMR

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Title: Antiferromagnetic ordering and estimation of the exchange interaction in the π-d system λ-(BEDSe-TTF)2FeCl4 studied using 13C NMR
Authors: Saito, Rikumaru Browse this author
Kobayashi, Takuya Browse this author →KAKEN DB
Taniguchi, Hiromi Browse this author →KAKEN DB
Fukuoka, Shuhei Browse this author →KAKEN DB
Kawamoto, Atsushi Browse this author →KAKEN DB
Issue Date: 15-Oct-2023
Publisher: American Physical Society (APS)
Journal Title: Physical Review B
Volume: 108
Issue: 15
Start Page: 155112
Publisher DOI: 10.1103/PhysRevB.108.155112
Abstract: We performed 13C NMR measurements on lambda-(BEDSe-TTF)2FeCl4[BEDSe-TTF = bis(ethylenediseleno) tetrathiafulvalene] to investigate the antiferromagnetic transition in this material and evaluate the exchange interaction J pi d between the donor molecules and FeCl-4 anions. Based on the NMR spectrum and the nuclear spin-lattice relaxation rate, we determined that the antiferromagnetic transition in the donor layers occurs at 25 K. The structure of the NMR spectra in the antiferromagnetic phase resembles that of lambda-(BEDSe-TTF)2GaCl4. We used the angle dependence of the NMR shift in the paramagnetic phase and the experimentally determined demagnetization factor to estimate J pi d of lambda-(BEDSe-TTF)2FeCl4 as 3.4(7) T/mu B . This result shows that the pi-d interaction of lambda-(BEDSe-TTF)2FeCl4 is weaker than that of lambda-(BETS)2FeCl4. The different signs of J pi d between lambda-(BEDSe-TTF)2FeCl4 and lambda-(BETS)2FeCl4 could be attributed to the different paths for the pi-d interaction in the two systems.
Rights: ©2023 American Physical Society
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河本 充司

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