Charge transfer gap for T'-RE2CuO4 and T-La2CuO4 as estimated from Madelung potential calculations
arXiv:cond-mat/0603403 · doi:10.1016/j.physc.2006.03.087
Abstract
T'-RE2CuO4 (RE: rare-earth element), after appropriate "reduction", has fairly high conductivity and also exhibits clear Fermi edge in photoemission spectroscopy. To clarify the origin of conductivity in the T' mother compounds, we evaluated the unscreened charge-transfer gap for T'-RE2CuO4 and T-La2CuO4. The value of charge-transfer gap for T'-compounds almost linearly decreases with increasing the ionic radius of RE from 12.24 eV for T'-Tm2CuO4 to 9.90 eV for T'-La2CuO4. The results qualitatively explain metallic conductivity in T'-RE2CuO4 for large RE.
arXiv comment12 pages, 1 figure, Proceedings of ISS 2005
References in corpus (4)
- New class of T-prime-structure cuprate superconductors
- Phase control of La2CuO4 in thin-film synthesis
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- Origin of superconducting carriers in "non-doped" T'- (La,RE)2CuO4 (RE = Sm, Eu, Gd, Tb, Lu, and Y) prepared by molecular beam epitaxy