Substitution Effect by Deuterated Donors on Superconductivity in $κ$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Br

Details Substitution Effect by Deuterated Donors on Superconductivity in $κ$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Br Substitution Effect by Deuterated Donors on Superconductivity in $κ$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Br

2004-02-04

arxiv.org/abs/cond-mat/0402115v1

J. Phys. Soc. Jpn., 73 (2004) 1434-1437.

Physics

Condensed Matter

Superconductivity

J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.73.1434

We investigate the superconductivity in the deuterated BEDT-TTF molecular substitution system $\kappa$-[(h8-BEDT-TTF)$_{1-x}$(d8-BEDT-TTF)$_x$]$_2$Cu[N(CN)$_2$]Br, where h8 and d8 denote fully hydrogenated and deuterated molecules, respectively. Systematic and wide range ($x$ = 0 -- 1) substitution can control chemical pressure finely near the Mott boundary, which results in the modification of the superconductivity. After cooling slowly, the increase of $T_{\textrm{c}}$ observed up to $x \sim$ 0.1 is evidently caused by the chemical pressure effect. Neither reduction of $T_{\textrm{c}}$ nor suppression of superconducting volume fraction is found below $x \sim$ 0.5. This demonstrates that the effect of disorder by substitution is negligible in the present system. With further increase of $x$, both $T_{\textrm{c}}$ and superconducting volume fraction start to decrease toward the values in $x$ = 1.

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