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Compensation of Effective Field in the Field-Induced Superconductor k-(BETS)2FeBr4 Observed by 77Se NMR | S. Fujiyama
; M. Takigawa
; J. Kikuchi
; H-B. Cui
; H. Fujiwara
; H. Kobayashi
; PostScript
; PDF
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; | Date: |
4 Feb 2006 | Subject: | Superconductivity; Strongly Correlated Electrons | Abstract: | We report results of 77Se NMR frequency shift in the normal state of the organic charge-transfer-salt k-(BETS)2FeBr4 which shows magnetic field-induced superconductivity (FISC). From a simple mean field analysis, we determined the field and the temperature dependences of the magnetization m_{pi} of the pi conduction electrons on BETS molecules. We found that the Fe spins are antiferromagnetically coupled to the pi electrons and determined the exchange field to be J = -2.3T/mu_B. The exchange field from the fully saturated Fe moments (5 mu_B) is compensated by an external field of 12T. This is close to the central field of the FISC phase, consistent with the Jaccarino-Peter local field-compensation mechanism for FISC (Phys. Rev. Lett. 9, 290 (1962)). | Source: | arXiv, cond-mat/0602099 | Services: | Forum | Review | PDF | Favorites |
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