Abstract
We report the synthesis and basic physical properties of single crystals ofCaFe2As2, a compoundisostructural to BaFe2As2 which has been recently doped to produce superconductivity.CaFe2As2 crystallizes in theThCr2Si2 structure withlattice parameters a = 3.887(4) Å and c = 11.758(23) Å. Magnetic susceptibility, resistivity, and heat capacity all show a first order phase transition atT0 = 171 K. The magnetic susceptibility is nearly isotropic from 2 to350 K. The heat capacity data gives a Sommerfeld coefficient of8.2 ± 0.3 mJ mol−1 K−2, and does not reveal any evidence for the presence of high frequency(>300 K) optical phonon modes. The Hall coefficient is negative below the transition, indicatingdominant n-type carriers.
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