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arXiv 1312.6705cond-mat.supr-con
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Ba(1-x)Heat capacity(0.1 <= x <= 0.9)系列超导体transition temperature的T_c跃变和压力导数

Heat capacity jump at T_c and pressure derivatives of superconducting transition temperature in the Ba(1-x)NaxFe2As2 (0.1 <= x <= 0.9) series

Sergey L. Bud'ko, Duck Young Chung, Daniel Bugaris, Helmut Claus, Mercouri G. Kanatzidis, Paul C. Canfield

摘要:

本文研究了Ba(1-x)NaxFe 2As 2系列铁基超导体中,与超导转变有关的初始(~ 10 kbar)流体静力学、压力依赖性和环境压力跃变的演化,它们是Na掺杂的函数。当Na浓度为0.15 <= x <= 0.9时,T_c处比热的跃变Δ C_p遵循大多数BaFe_2As_2基超导体的Δ C_p ~ T^3标度。对于x = 0.2和x = 0.24,压力依赖性是非单调的。对于其它Na浓度,T_c在压力下几乎呈线性下降。x = 0.2和x = 0.24样品在压力下的反常行为可能是由于施加压力时,Ba(1-x)NaxFe 2As 2系列所特有的窄反铁磁四元相的相界发生了交叉。

英文摘要:

We present the evolution of the initial (up to ~ 10 kbar) hydrostatic, pressure dependencies of T_c and of the ambient pressure jump in the heat capacity associated with the superconducting transition as a function of Na - doping in the Ba(1-x)NaxFe2As2 family of iron-based superconductors. For Na concentrations 0.15 <= x <= 0.9, the jump in specific heat at T_c, Delta C_p, follows the Delta C_p ~ T^3 scaling found for most BaFe2As2 - based superconductors. Pressure dependencies are non-monotonic for x = 0.2 and x = 0.24. For other Na concentrations T_c decreases under pressure in almost linear fashion. The anomalous behavior of the x = 0.2 and x = 0.24 samples under pressure are possibly due to the crossing of the phase boundaries of the narrow antiferromagnetic tetragonal phase, unique for the Ba(1-x)NaxFe2As2 series, with the application of pressure.

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