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Magnetic state in the quasi-two-dimensional organic conductor λ-(BEST)2FeCl4 and the path of π-d interaction

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Title: Magnetic state in the quasi-two-dimensional organic conductor λ-(BEST)2FeCl4 and the path of π-d interaction
Authors: Saito, Rikumaru Browse this author
Iida, Youhei Browse this author
Kobayashi, Takuya Browse this author
Taniguchi, Hiromi Browse this author
Matsunaga, Noriaki Browse this author
Fukuoka, Shuhei Browse this author
Kawamoto, Atsushi Browse this author →KAKEN DB
Issue Date: 11-Apr-2022
Publisher: American Physical Society (APS)
Journal Title: Physical Review B
Volume: 105
Issue: 16
Start Page: 165115
Publisher DOI: 10.1103/PhysRevB.105.165115
Abstract: Studies of the quasi-two-dimensional organic conductors λ-(D)2MCl4 [D = donor molecules, M = Ga, Fe] have shown that λ-(BETS)2GaCl4 [BETS = bis(ethylenedithio)tetraselenafulvalene] undergoes an unconventional superconducting transition and λ-(BETS)2FeCl4 undergoes a field-induced superconducting transition. In λ-type salts, the interactions between donor molecules and FeCl4- (π-d interactions) are important. To investigate π-d interaction, a pair of magnetic M = Fe and nonmagnetic M = Ga salts which have the same ground state in the donor layer is desired. However, no such pair has been found, and few experimental studies have considered π-d interaction paths. λ-(BEST)2MCl4 [BEST = bis(ethylenediseleno)tetrathiafulvalene] are obtained for both anions, and M = Ga salt shows an antiferromagnetic transition, but the ground state has not been analyzed in M = Fe salt. We perform x-ray diffraction, magnetic susceptibility measurement, and Mossbauer spectroscopy in λ-(BEST)2FeCl4. We find that a magnetic transition is observed at around 26 K. The λ-(BEST)2MCl4 system is a system in which both FeCl4- and GaCl4- salts show antiferromagnetic transitions. In addition, the ethylene motions observed at room temperature are ordered around 108 K, resulting in the establishment of the π-d interaction path between chalcogens and the anion, and low-field magnetization suggests that the π-d interaction in λ-(BEST)2FeCl4 is smaller than that in λ-(BETS)2FeCl4. Our results show that the inner chalcogen of donor molecules is important as the path of the interaction.
Rights: ©2022 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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