2008/06/30 by J. K. Dong, L. Ding, H Wang +10
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Anomaly (physics) #Antiferromagnetism #Condensed matter physics #Debye model #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Nuclear magnetic resonance #Physics #Single crystal #Specific heat #Superconducting transition temperature #Superconductivity #Transition temperature #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1088/1367-2630/10/12/123031
published as New Journal of Physics 10 (2008) 123031
arxiv created 2008/06/30 · openalex publication_date 2008/12/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The specific heat C ( T ) of a BaFe 2 As 2 single crystal and hole-doped superconducting Ba 0.5 K 0.5 Fe 2 As 2 and Ca 0.5 Na 0.5 Fe 2 As 2 polycrystals were measured. For the undoped BaFe 2 As 2 single crystal, a very sharp specific heat peak was observed at 136 K. This is attributed to the structural and antiferromagnetic transitions occurring at the same temperature. For the superconducting Ba 0.5 K 0.5 Fe 2 As 2 polycrystal, a clear peak of C / T was observed at T c =36 K, which is the highest peak seen at a superconducting transition for iron-based high- T c superconductors so far. For the superconducting Ca 0.5 Na 0.5 Fe 2 As 2 sample with lower T c =18 K, there is no obvious anomaly in C / T below T c , which may be due to its low superfluid density. The electronic specific heat coefficients γ and Debye temperatures Θ D of these compounds were obtained from the low-temperature data.