  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.

Superconductivity