TY - JOUR
T1 - Substitution effect by deuterated donors on superconductivity in κ-(BEDT-TTF)2Cu[N(CN)2]Br
AU - Yoneyama, Naoki
AU - Sasaki, Takahiko
AU - Kobayashi, Norio
PY - 2004/6
Y1 - 2004/6
N2 - We investigate the superconductivity in the deuterated BEDT-TTF molecular substitution system κ-[(h8-BEDT-TTF)1-x(d8-BEDT-TTF) x]2Cu[N(CN)2]Br, where h8 and d8 denote fully hydrogenated and deuterated molecules, respectively. Systematic and wide-range (x = 0-1) substitution can accurately control chemical pressure near the Mott boundary, which results in the modification of the superconductivity. After cooling slowly, an increase in Tc observed up to x ∼ 0.1 is evidently caused by the chemical pressure effect. Neither a reduction of T c nor a suppression of superconducting volume fraction is found below x ∼ 0.5. This demonstrates that the effect of disorder by substitution is negligible in the present system. With further increase in x, both Tc and superconducting volume fraction start to decrease toward values at x = 1.
AB - We investigate the superconductivity in the deuterated BEDT-TTF molecular substitution system κ-[(h8-BEDT-TTF)1-x(d8-BEDT-TTF) x]2Cu[N(CN)2]Br, where h8 and d8 denote fully hydrogenated and deuterated molecules, respectively. Systematic and wide-range (x = 0-1) substitution can accurately control chemical pressure near the Mott boundary, which results in the modification of the superconductivity. After cooling slowly, an increase in Tc observed up to x ∼ 0.1 is evidently caused by the chemical pressure effect. Neither a reduction of T c nor a suppression of superconducting volume fraction is found below x ∼ 0.5. This demonstrates that the effect of disorder by substitution is negligible in the present system. With further increase in x, both Tc and superconducting volume fraction start to decrease toward values at x = 1.
KW - Chemical pressure
KW - Cooling rate
KW - Deuterium substitution
KW - Mott transition
KW - Organic superconductor
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U2 - 10.1143/JPSJ.73.1434
DO - 10.1143/JPSJ.73.1434
M3 - Article
AN - SCOPUS:20344405219
SN - 0031-9015
VL - 73
SP - 1434
EP - 1437
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 6
ER -