Photoelectron spectroscopic study of ϰ-(BEDT-TTF)2Cu(NCS)2 organic superconductor

✍ Scribed by R. Itti; H. Mori; K. Ikeda; I. Hirabayashi; N. Koshizuka; S. Tanaka

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 200 KB
• Volume: 185-189
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)91458-g

✦ Synopsis

An x-ray photoelectron spectroscopic (XPS) study of the 10.4K superconductor r-(BEDT-TrF)2Cu(NCS)2 is reported. Chemical environment of the atoms in this organic salt was discussed based on the XPS core-level results. Binding energies of the nonequivalent C and S sites in the donor BEDT-TTF and the anion Cu(NCS)2 are found to be different and an assignment is made. The valences of Cu and N were observed to be typically 1+ and 3-, respectively. XPS results indicate that bonding is somewhat covalent in BEDT-TTF while it is ionic in Cu(NCS) 2. Measurements of the valence band region revealed a broad valence band struetuae with several peak features. A very low spectral intensity at the Fermi level is observed.