Abstract
Electron paramagnetic resonance is used to study the CDW state of K 0.30MoO 3 in the temperature range 4 K-90 K. The spectra consist of three lines: g 1 = 2.11, ΔH 1 = 110 G, g 2 = 1.98, ΔH 2 = 17.5 G, g 3 = 1.93, ΔH 3 = 15 G. The line 3 is attributed to Mo 5+ paramagnetic centers due to nonstoichiometry. The lines 2 and 3 can easily be saturated below ∼ 40 K. Additional narrow lines superimposed on the line 3 vanish at ∼ 55 K while the line 3 is observed up to ∼ 90 K. EPR spectra are influenced by the simultaneous application of a dc voltage at low temperatures. These results are discussed in terms of coexistence of commensurate and incommensurate regions and in relation with structural data and also with the unusual non linear transport at low temperatures.
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