Abstract
We have made a high-resolution photoemission (PES) and x-ray absorption (XAS) study of quasi-one-dimensional partially deuterated (DMe-DCNQI)2Cu. The PES spectra in the metallic phase exhibit a power-law dependence on the electron binding energy ω on a high energy scale (∼0.3 eV>|ω|>∼0.05 eV) or at high temperatures (T>∼300 K) while a weak but finite intensity is found at the Fermi level at low temperatures, indicating a weak 3D character. From the N 1s and Cu 2p XAS spectra, we clearly observe the mixed valence state of Cu and the strong anisotropy of the electronic structure although 3D character is also found.
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