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Time-resolved photoresponse measurements of the electrical conductivity of the quasi-two-dimensional organic superconductor β-(BEDT-TTF) I using a nanosecond laser pulse

Journal of Physical Chemistry C, ISSN: 1932-7447, Vol: 115, Issue: 48, Page: 23998-24003
2011
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  • Citations
    7
    • Citation Indexes
      7
  • Captures
    11

Article Description

Time-resolved photoresponses in resistance have been measured following the nanosecond laser pulse excitation for the quasi-two-dimensional organic superconductors of hydrogenated and deuterated β-(BEDT-TTF) I [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene], which show two different superconducting states with high-T and low-T, at temperatures near the critical temperatures. A transient increase of the resistance is induced by photoirradiation at all the temperatures, but a marked temperature dependence of the decay time is observed at temperatures close to the high-T phase transition temperature; the decay rate becomes faster and then becomes constant in both compounds, as the temperature decreases across the high-T phase transition temperature. The temperature dependence of the photoresponse intensity is different from the one expected from the bolometric effects, indicating the presence of the nonbolometric photoresponse. A possible mechanism explaining the photoresponse of the conductivity is discussed, based on the isotope effect on the photoresponse. A comparison is also made between β-(BEDT-TTF) I and κ-(BEDT-TTF)Cu[N(CN) ]Br for the transient photoresponse in resistance at temperatures across the metal-superconductor phase transition temperature. © 2011 American Chemical Society.

Bibliographic Details

Toshifumi Iimori; Farzana Sabeth; Nobuhiro Ohta; Toshio Naito

American Chemical Society (ACS)

Materials Science; Energy; Chemistry

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