F. Ronning, Tomasz Klimczuk, Tomasz Klimczuk
Jun 27, 2008
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Journal of Physics: Condensed Matter
Abstract
We report the synthesis and basic physical properties of single crystals of CaFe2As2, a compound isostructural to BaFe2As2 which has been recently doped to produce superconductivity. CaFe2As2 crystallizes in the ThCr2Si2 structure with lattice 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 at T0 = 171 K. The magnetic susceptibility is nearly isotropic from 2 to 350 K. The heat capacity data gives a Sommerfeld coefficient of 8.2 ± 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, indicating dominant n-type carriers.