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 journalArticlepeer-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 languageEnglish
Article number064504
JournalPhysical Review B
Volume94
Issue number6
DOIs
Publication statusPublished - 2016 Aug 4

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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