Isotope effect in {sup 13}C-substituted (central C=C) {kappa}-phase organic superconductors
Conference
·
OSTI ID:10180356
- Argonne National Lab., IL (United States)
- Bio-Rad, Digilab Div., Cambridge MA (United States)
The organic electron-donor molecule ET [bis(ethylenedithio)tetrathiafulvalene] was synthesized twice by the identical route: (a) with natural ({sup 12}C) carbon isotopic distribution; (b) with 95% {sup 13}C, in the central C=C double bond position. The superconducting transition temperatures (in magnetic fields of 0.0--0.4 T) of single crystals prepared by both routes of ET synthesis were found, by the use of ac susceptibility measurements, to be identical within the precision of the measurements ({approximately}O.lK or 1%) for the ambient-pressure superconductors {kappa}(ET){sub 2}Cu(NCS){sub 2} and {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Br. The absence of an effect of such isotopic replacement on Tc indicates that the central C=C stretching vibration (a high-energy optical mode at {approximately}1500 cm{sup {minus}1}) is not the dominant contributor to the superconducting pairing mechanism in these systems.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10180356
- Report Number(s):
- ANL/CP--76908; CONF-9208132--2; ON: DE92040748
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:7241233
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