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Static and dynamic interaction between pi and d electrons in organic superconductor beta ''-(BEDT-TTF)(4)[(H3O)Fe(C2O4)(3)] center dot C6H5Br studied by C-13 NMR spectroscopy

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Title: Static and dynamic interaction between pi and d electrons in organic superconductor beta ''-(BEDT-TTF)(4)[(H3O)Fe(C2O4)(3)] center dot C6H5Br studied by C-13 NMR spectroscopy
Authors: Ihara, Y. Browse this author
Futami, Y. Browse this author
Kawamoto, A. Browse this author
Matsui, K. Browse this author
Goto, T. Browse this author
Sasaki, T. Browse this author
Benmansour, S. Browse this author
Gomez-Garcia, C. J. Browse this author
Issue Date: 5-Aug-2016
Publisher: American Physical Society (APS)
Journal Title: Physical Review B
Volume: 94
Issue: 6
Start Page: 064504
Publisher DOI: 10.1103/PhysRevB.94.064504
Abstract: We present the results of C-13 NMR experiments in an organic superconductor with localized Fe spins beta ''-(BEDT-TTF)(4)[(H3O)Fe(C2O4)(3)] center dot C6H5Br. We reveal the antiferromagnetic coupling between Fe d spins and pi spins, which creates an exchange field antiparallel to the external field direction at the pi electrons. In addition to the static effects of Fe spins, we show from the nuclear spin-lattice relaxation rate measurement that the magnetic fluctuations generated by Fe spins are suppressed at low temperatures and high magnetic fields. These conditions are suitable to stabilize the field-induced superconductivity by the field compensation mechanism. After the suppression of Fe-spin dynamics by a magnetic field of 19 T, we observed the underlying pi-electron contribution. We discuss a possible anomaly in the pi-electron system.
Rights: ©2016 American Physical Society
Type: article
URI: http://hdl.handle.net/2115/63065
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: 井原 慶彦

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