Physics – Condensed Matter – Superconductivity
Scientific paper
2007-12-20
J. Phys.: Conf. Ser. 97 (2008) 012121
Physics
Condensed Matter
Superconductivity
7 pages, 7 figures, 1 table, presenthed at the Eucas 2007 conference. Accepted for "Journal of Physics: Conference Series (JPC
Scientific paper
10.1088/1742-6596/97/1/012121
Polycrystalline samples and submillimeter size single crystals of Na-doped Ca2CuO2Cl2 have been synthesized under high pressure. A series of experiments showed that the Na content depends not only on the pressure during the synthesis but also on the synthesis temperature and time. From a comparison of the Na-CCOC data with those of structurally related La214 cuprate superconductors we concluded that chlorine at the apical site is less effective that oxygen in supplying charge carriers to the CuO2 plans. As a result, the coupling between the CuO2 planes is weakened, the transition temperature Tc is reduced and the anisotropic nature is enhanced.
Karpinski Janusz
Katrych Sergiy
Keller Hugo
Khasanov Rustem
Wagli P.
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