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Antiferromagnetic phase in β'-(BEDT-TTF)2ICl2 under pressure as seen via 13C NMR

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Title: Antiferromagnetic phase in β'-(BEDT-TTF)2ICl2 under pressure as seen via 13C NMR
Authors: Eto, Yoshihiro Browse this author
Kawamoto, Atsushi Browse this author
Issue Date: 1-Jan-2010
Publisher: American Physical Society
Journal Title: Physical Review B
Volume: 81
Issue: 2
Start Page: 020512
Publisher DOI: 10.1103/PhysRevB.81.020512
Abstract: We assessed carbon-13 nuclear magnetic resonance (13C NMR) measurements of the layered organic salt β'-(BEDT-TTF)2ICl2, which exhibits antiferromagnetic transition at ambient pressure and 22 K and superconductive transition at 8.2 GPa and 14.2 K (the highest known superconductive transition temperature among organic superconductors). By analyzing the 13C NMR spectrum with the tensor, we determined the antiferromagnetic moment of this salt to be μB per dimer at ambient pressure, strongly indicating that this salt is a dimer Mott insulator. From NMR measurements under pressure, we found that the structure of the antiferromagnetic phase changed at 0.6 GPa. The moment of this antiferromagnetic phase was estimated to be 0.47 μB per dimer at 0.6 GPa and 26 K. In addition, applying pressure rapidly decreased the spin susceptibility in the paramagnetic state, and the pressure dependence of TN showed anomalous behavior consistent with theoretical proposals, including dimensional crossover.
Rights: ©2010 The 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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