The superconducting phase of organic superconductor κ‐(BEDT‐TTF)2Cu[N(CN)2]Br was studied by the electron tunneling using STM. Tunneling spectra were obtained at partially deuterated κ‐(BEDT‐TTF‐d[3,3])2Cu[N(CN)2]Br. The tunneling conductance curve exhibits clear superconducting gap structure. Tunneling spectra with linear dependence on the energy are explained by d‐wave pairing. We obtained the gap parameter as a function of the effective correlation strength, which can be controlled by partial deuteration. The large gap value suggests strong coupling superconductivity. Moreover, a zero bias conductance peak (ZBCP) was found in d[3,3] salt. d‐wave pairing in κ‐(BEDT‐TTF)2X is strongly supported.

Topics
Organic superconductors, Superconductivity, Spectroscopy, Electron tunneling
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© 2006 American Institute of Physics.
2006
American Institute of Physics
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