open access

https://hdl.handle.net/2115/48386

Carrier Dynamics in a Series of Organic Magnetic Superconductors

英語

2012-01-26

American Chemical Society

Journal of Physical Chemistry C

116(3)

2588-2593

Understanding how electrons behave, i.e., carrier dynamics, in superconductors is indispensable for understanding the mechanism of superconductivity. Recently we have reported the carrier dynamics of κ- and λ-(BETS)2MCl4 (BETS = bis(ethylenedithio)tetraselenafulvalene, M = Ga, Fe) based on ultrafast spectroscopy, but the interpretation of the results remains an open question. In this paper we interpreted the results with the aid of newly measured magnetic susceptibility, X-ray single crystal structural analysis, and band calculation. Observation of coherent phonons only in the λ-type salts indicated that e-ph interaction should be characteristically strong in the λ-type salts. By comparison of the observed carrier dynamics with a two-temperature model, the temperature-dependence of carrier dynamics is consistently explained by the different strengths of the e-ph interaction between the λ- and the κ-type salts. The difference in strength of the e-ph interactions is related to their crystal structures. In conclusion, their carrier dynamics is consistently interpreted and classified by their crystal structures.

学術雑誌論文

Version of Record

1932-7447