X-ray fluorescence measurements of organic superconductors κ−(ET)2Cu[N(CN)2]Br and κ−(ET)2Cu(NCS)2
E. Z. Kurmaev, S. N. Shamin, Y.-N. Xu, W. Y. Ching, A. Moewes, D. L. Ederer, E. B. Yagubskii, N. D. Kushch
DOI 10.1103/PhysRevB.60.13169 · Physical Review B
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Abstract
The electronic structure of organic superconductors κ−(ET)2Cu[N(CN)2]Br and κ−(ET)2Cu(NCS)2 has been studied in detail by means of soft x-ray fluorescence spectroscopy. Cu L3, S L2,3, C Kα, and N Kα x-ray emission spectra are measured near the corresponding thresholds with synchrotron radiation. The experimental information about site-selective and symmetry-restricted partial density of states in the valence band of both compounds is compared with first-principles band-structure calculations and ultraviolet photoemission spectra. It is found that copper is monovalent in both compounds indicating that the electron is transferred from (ET) dimer to Cu(NCS)2 and Cu[N(CN)2]Br and is localized mainly on the Cu site.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(ET)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.6 | Pressure not reported | unknown |
| κ-(ET)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.4 | Pressure not reported | unknown |
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