Details

Autor(en) / Beteiligte

• Ronning, F
• Klimczuk, T
• Bauer, E D
• Volz, H
• Thompson, J D

Titel

Synthesis and properties of CaFe2As2 single crystals

Ist Teil von

• Journal of physics. Condensed matter, 2008-08, Vol.20 (32), p.322201-322201 (4)

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2008

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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) A and c = 11.758(23) A. 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.