1301.3579 (Yan Zheng et al.)

High Pressure Evolution of the Specific Heat of a BaFe(1-xCox)2As2 Iron
Pnictide Superconductor    [PDF]

Yan Zheng, Yuxing Wang, Anna E. Böhmer, Thomas Wolf, Christoph Meingast, R. Lortz

We report specific-heat experiments under the influence of high pressure on a strongly underdoped Co-substituted BaFe2As2 sample. This allows us to investigate the phase diagram of this iron pnictide superconductor with a bulk thermodynamic method and pressure as a clean control parameter. The data shows large specific-heat anomalies at the superconducting transition, proving the bulk nature of superconductivity. The optimal Tc value as well of the superconducting condensation energy are found to be larger than in the purely doped system, which we attribute to pair breaking due to Co impurities.

View original: http://arxiv.org/abs/1301.3579