期刊
PHYSICAL REVIEW B
卷 79, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.214505
关键词
barium compounds; cobalt; iron compounds; specific heat; superconducting transition temperature; superconducting transitions; thermal expansion measurement
High-resolution thermal expansion measurements of single crystalline BaFe1.84Co0.16As2 and BaFe1.77Co0.23As2 in the temperature range 5 < T < 300 K are reported. The thermal expansion is highly anisotropic, with the largest expansion along the c axis. Distinct anomalies are present at the normal-to-superconducting phase-transition temperature T-c; the phase transition appears to be continuous. No structural transitions are observed over the temperature range of our measurements. The thermal expansion data and heat-capacity data acquired on the same specimens are used to estimate the volumetric pressure derivative of T-c using the Ehrenfest relation.
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