Static and dynamic interaction between π and d electrons in organic superconductor β″-(BEDT-TTF)4[(H3O)Fe(C2O4)3]·C6H5Br studied by C13 NMR spectroscopy
Y. Ihara, Y. Futami, A. Kawamoto, K. Matsui, T. Goto, T. Sasaki, S. Benmansour, C. J. Gómez-García
DOI 10.1103/PhysRevB.94.064504 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| β"-(BEDT-TTF)4[(H3O)Fe(C2O4)3]·C6H5Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure unresolved | unknown |
| β"-(BEDT-TTF)4[(H3O)Ga(C2O4)3]·C6H5NO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.5 | Pressure not reported | unknown |
| Eu1-xSnxMo6S8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | unknown |
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