Charge transfer degree and superconductivity of the incommensurate organic superconductor (MDT-TSF)(I3)0.422

Physical Review B - Condensed Matter and Materials Physics Volume 73 Issue 9 Page 094513-1-094513-8 published_at 2006-03-24
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Title ( eng )
Charge transfer degree and superconductivity of the incommensurate organic superconductor (MDT-TSF)(I3)0.422
Creator
Kawamoto Tadashi
Mori Takehiko
Konoike Takako
Enomoto Kengo
Terashima Taichi
Uji Shinya
Kitagawa Hiroshi
Takimiya Kazuo
Otsubo Tetsuo
Source Title
Physical Review B - Condensed Matter and Materials Physics
Volume 73
Issue 9
Start Page 094513-1
End Page 094513-8
Abstract
The influence of a small change of carrier number on the superconducting transition temperature Tc in the incommensurate organic superconductors is investigated for (MDT-TSF) (I3) 0.422 (MDT-TSF: methylenedithio- tetraselenafulvalene, Tc =4.9 K) in comparison with (MDT-TSF) (AuI2) 0.436 (Tc =4.5 K). Careful estimation of the degree of charge transfer by means of the Raman spectra as well as the Shubnikov–de Haas (SdH) oscillations indicates that the charge-transfer degree 0.422 for the I3 salt is obviously smaller than 0.436 in the AuI2 salt. According to the band calculation, the former salt has smaller density of states. However, the former salt exhibits higher Tc than the latter compounds, and this disagrees with the naive prediction of the BCS theory. The former salt shows considerably large effective cyclotron mass extracted from the SdH oscillations. These observations demonstrate that the strength of the many-body effect is the major factor that determines Tc in these organic superconductors.
Language
eng
Resource Type journal article
Publisher
American Physical Society
Date of Issued 2006-03-24
Rights
Copyright (c) 2006 American Physical Society.
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0163-1829
[DOI] 10.1103/PhysRevB.73.094513
[NCID] AA00362255
[DOI] http://dx.doi.org/10.1103/PhysRevB.73.094513