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Single crystals of CaLaFeAs with ranging from 0 to 0.25, have been grown and characterized by structural, transport, and magnetic measurements. Coexistence of two superconducting phases is observed, in which the phase with the lower superconducting transition temperature ( ) has ∼ 20 K and the higher phase has higher than 40 K. These data also delineate an - phase diagram in which the single magnetic/structural phase transition in undoped CaFeAs appears to split into two distinct phase transitions, both of which are suppressed with increasing La substitution. Superconductivity emerges when is about 0.06 and coexists with the structural/magnetic transition until is 0.13. With increasing concentration of La, the structural/magnetic transition is totally suppressed, and reaches its maximum value of about 45 K for 0.15 ⩽ ⩽ 0.19. A domelike superconducting region is not observed in the phase diagram, however, because no obvious over-doping region can be found. Two superconducting phases coexist in the - phase diagram of CaLaFeAs. The formation of the two separate phases and the origin of the high in CaLaFeAs have been studied and discussed in detail.


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