Spin density wave conduction

We have measured with great accuracy the reflectivity of electron doped Pr2 sCe, Cu() at various Ce doping levels. An optical conductivity spectral weight analysis shows that a partial gap opens at low temperatures for Ce concentrations up to x = 0.15. A spin density wave model reproduces satisfactorily the data. 

TMTSF)2C104 the two susceptibilities give evidence for an incomplete spin density wave transition at T 5 K at intermediate cooling rates reminiscent of the features in some conductivity measurements (93). At the superconducting transition the susceptibility vanishes, but the transition temperature is lower than that deduced from conductivity (97). 

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