J. Phys. I France
Volume 2, Numéro 7, July 1992
Page(s) 1257 - 1262
DOI: 10.1051/jp1:1992207
J. Phys. I France 2 (1992) 1257-1262

Anisotropic resistivity and thermopower of the organic superconductor (ET) 2Cu[ N(CN) 2] Br

L.I. Buravov, N.D. Kushch, V.A. Merzhanov, M.V. Osherov, A.G. Khomenko and E.B. Yagubskii

Institute of Chemical Physics in Chernogolovka, Russian Academy of Sciences, Chernogolovka MD, 142432 Russia

(Received 23 April 1992, accepted 12 May 1992)

We have measured the temperature dependence of the resistivity of (ET) 2Cu [ N(CN) 2] Br in three crystallographic directions and the thermopower in the a and c directions. the resistivity has two maxima - at 75 and 95 K. The value of the resistivity anisotropy is rather large: $\rho_b/\rho_a$ is about 10 3 at the ambient temperature and increases with lowering temperature below 50 K. The temperature derivative of resistivity exhibits a strong maximum at 50 K. Thermopower is positive for the a direction, while it is negative for the c direction. We have concluded, that (ET) 2Cu[ N(CN) 2] Br undergoes insulator-metal transition near 50 K similarly to (ET) 2Cu(NCS) 2.

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