Static and dynamic interaction between π and d electrons in organic superconductor β″ -(BEDT-TTF) 4[(H3 O)Fe(C2 O4)3]· C6

Y. Ihara; Y. Futami; A. Kawamoto; K. Matsui; T. Goto; T. Sasaki; S. Benmansour; C. J. Gómez-García

doi:10.1103/PhysRevB.94.064504

Static and dynamic interaction between π and d electrons in organic superconductor β″ -(BEDT-TTF) 4[(H3 O)Fe(C2 O4)3]· C6

Y. Ihara, Y. Futami, A. Kawamoto, K. Matsui, T. Goto, T. Sasaki, S. Benmansour, C. J. Gómez-García

Research output: Contribution to journal › Article › peer-review

Abstract

We present the results of C13 NMR experiments in an organic superconductor with localized Fe spins β″-(BEDT-TTF)4[(H3O)Fe(C2O4)3]·C6H5Br. We reveal the antiferromagnetic coupling between Fe d spins and π spins, which creates an exchange field antiparallel to the external field direction at the π 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 π-electron contribution. We discuss a possible anomaly in the π-electron system.

Original language	English
Article number	064504
Journal	Physical Review B
Volume	94
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.94.064504
Publication status	Published - 2016 Aug 4
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.94.064504

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@article{b99458fc544941088092a0ec33bdb4fa,

title = "Static and dynamic interaction between π and d electrons in organic superconductor β″ -(BEDT-TTF) 4[(H3 O)Fe(C2 O4)3]· C6",

abstract = "We present the results of C13 NMR experiments in an organic superconductor with localized Fe spins β″-(BEDT-TTF)4[(H3O)Fe(C2O4)3]·C6H5Br. We reveal the antiferromagnetic coupling between Fe d spins and π spins, which creates an exchange field antiparallel to the external field direction at the π 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 π-electron contribution. We discuss a possible anomaly in the π-electron system.",

author = "Y. Ihara and Y. Futami and A. Kawamoto and K. Matsui and T. Goto and T. Sasaki and S. Benmansour and G{\'o}mez-Garc{\'i}a, {C. J.}",

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doi = "10.1103/PhysRevB.94.064504",

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T1 - Static and dynamic interaction between π and d electrons in organic superconductor β″ -(BEDT-TTF) 4[(H3 O)Fe(C2 O4)3]· C6

AU - Ihara, Y.

AU - Futami, Y.

AU - Kawamoto, A.

AU - Matsui, K.

AU - Goto, T.

AU - Sasaki, T.

AU - Benmansour, S.

AU - Gómez-García, C. J.

PY - 2016/8/4

Y1 - 2016/8/4

N2 - We present the results of C13 NMR experiments in an organic superconductor with localized Fe spins β″-(BEDT-TTF)4[(H3O)Fe(C2O4)3]·C6H5Br. We reveal the antiferromagnetic coupling between Fe d spins and π spins, which creates an exchange field antiparallel to the external field direction at the π 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 π-electron contribution. We discuss a possible anomaly in the π-electron system.

AB - We present the results of C13 NMR experiments in an organic superconductor with localized Fe spins β″-(BEDT-TTF)4[(H3O)Fe(C2O4)3]·C6H5Br. We reveal the antiferromagnetic coupling between Fe d spins and π spins, which creates an exchange field antiparallel to the external field direction at the π 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 π-electron contribution. We discuss a possible anomaly in the π-electron system.

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Static and dynamic interaction between π and d electrons in organic superconductor β″ -(BEDT-TTF) 4[(H3 O)Fe(C2 O4)3]· C6

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