Direct Observation and Interpretation of Carrier Dynamics of Molecular Magnetic Superconductors

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Abstract

The temperature-dependent time-resolved reflectance spectra of the organic superconductors (OSs) κ- and λ-(BETS)2MCl4 (M=Fe, Ga) and κ-(ET)2Cu[N(CN)2]Br are reported. The π electrons of the organic molecules (BETS or ET) are responsible for the electrical conduction in these salts, while only the Fe-containing salts have localized spins on the d electrons in the Fe atoms (S=5/2) with π–d interaction. Analysis of the spectra provided the relaxation time τ of the carriers, as well as information concerning the number of carriers at the Fermi energy N(E F). The carrier dynamics were classified in terms of high-T C and low-T C OSs. In these salts, the results indicate that (1) the electron-phonon interaction is important in the occurrence and stability of the superconducting phase, and (2) electron correlation can be related to the enhancement of T C.

Keywords

Time-resolved spectroscopy Organic magnetic superconductor BETS salts ET salts Superconducting mechanism 
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Notes

Acknowledgements

This work was partly supported by the Itoh Science Foundation, The Japan Securities Scholarship Foundation, and a Grant-in-Aid for Scientific Research (C) from the Japan Society for the Promotion of Science (KAKENHI-23540432).

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  1. 1.Department of Chemistry and Biology, Graduate School of Science and EngineeringEhime UniversityMatsuyamaJapan
  2. 2.Department of Chemistry, Graduate School of ScienceHokkaido UniversitySapporoJapan
  3. 3.Department of Applied Physics, Graduate School of EngineeringHokkaido UniversitySapporoJapan

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