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arXiv 1303.2010cond-mat.supr-con
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Ba1-xKxFe2As2(0.2 < x < 1.0)系列超导体transition temperature在Tc处的Heat capacity跃变和压力导数

Heat capacity jump at Tc and pressure derivatives of superconducting transition temperature in the Ba1-xKxFe2As2 (0.2 < x < 1.0) series

Sergey L. Bud'ko, Mihai Sturza, Duck Young Chung, Mercouri G. Kanatzidis, Paul C. Canfield

摘要:

我们提出的演变的初始(高达~ 10千巴)的流体静力学,压力依赖性的Tc和环境压力跳变的热容量与超导转变作为一个功能的K -掺杂的Ba 1-xKxFe 2As 2家庭的铁基超导体。压力导数在x ~ 0.7附近显示出微弱但明显的异常。在相同的浓度范围内,Tc处的Δ Cp偏离了大多数BaFe 2As 2基超导体的Δ Cp ~ T^3标度。这些结果与Lifshitz转变一致,并且可能发生在x ~ 0.7附近的超导状态的显著修改。

英文摘要:

We present the evolution of the initial (up to ~ 10 kbar) hydrostatic, pressure dependencies of Tc and of the ambient pressure jump in the heat capacity associated with the superconducting transition as a function of K - doping in the Ba1-xKxFe2As2 family of iron-based superconductors. The pressure derivatives show weak but distinct anomaly near x ~ 0.7. In the same concentration region Delta Cp at Tc deviates from the Delta Cp ~ T^3 scaling found for most BaFe2As2 - based superconductors. These results are consistent with a Lifshitz transition, and possible significant modification of the superconducting state, occurring near x ~ 0.7.

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