Conductivity and magnetism by band filling control of organic conductors

H. Mori; M. Suto; H. Suzuki; Y. Nishio; K. Kajita

doi:doi:10.1051/jp4:2004114109

Numéro		J. Phys. IV France Volume 114, April 2004


Page(s)		467 - 470
DOI		https://doi.org/10.1051/jp4:2004114109

J. Phys. IV France 114 (2004) 467
DOI: 10.1051/jp4:2004114109

Conductivity and magnetism by band filling control of organic conductors

H. Mori^{1, 2, 1}, M. Suto^{1, 3}, H. Suzuki¹, Y. Nishio³ and K. Kajita³

¹ The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
² CREST, JST
³ Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan

Abstract
Recently the systematic band-filling control has been successfully carried out in organic conductors. The filling control to the various ground state was investigated by doping to the antiferromagnetic insulator for $\lambda$ -ET ₂(MCl ₄)_1-x(M'Cl ₄)_x, the non-magnetic insulator, $\delta$ '-ET ₂(MCl ₄)_1-x(M'Cl ₄)_x, the charge ordered conductor, $\alpha$ -ET ₃(M'Cl ₄)_1-x(MCl ₄)_x(TCE), and the band insulator $\beta$ '-ET ₃(M'Cl ₄)_2-x(MCl ₄)_x [M = Ga, Fe, M' = Co, Zn], respectively. he most drastic change was observed for $\beta$ '-ET ₃(M'Cl ₄)_2-x(MCl ₄)_x: the semiconducting behavior transforms to the metallic one from x = 0, 0.66, to 0.58. Moreover, by applying the pressure for x = 0.62, the metallic behavior was observed down to 4 K. On the other hand, the electronic state of the band-filled conductor with magnetic anions is also attractive. The ferromagnetic interaction through the doped carriers was observed for $\beta$ '-ET ₃(CoCl ₄)_2-x(FeCl ₄)_x. Key words. Band filling - ET salts - transport and magnetic properties.