Synthesis and properties of La-doped CaFe2As2 single crystals with Tc = 42.7 K

Details Synthesis and properties of La-doped CaFe2As2 single crystals with Tc = 42.7 K Synthesis and properties of La-doped CaFe2As2 single crystals with Tc = 42.7 K

2011-06-09

arxiv.org/abs/1106.1837v2

EPL 95 (2011) 67002

Physics

Condensed Matter

Superconductivity

13 pages, 5 figures

Scientific paper

Large single crystals of La-doped CaFe2As2 were successfully synthesized by the FeAs self-flux method. The x-ray diffraction patterns suggest high crystalline quality and c-axis orientation. By substitution of trivalent La3+ ions for divalent Ca2+, the resistivity anomaly in the parent compound CaFe2As2 is completely suppressed and a superconducting transition reaches the value of 42.7 K, which is higher than that of about 30 K reported in Saha S. R. et al., arXiv:1105.4798v1. The upper critical field has been determined with the magnetic field along ab-plane and c-axis, yielding an anisotropy of about 3.3.

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