Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe2As2 single crystals
Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe2As2 single crystals
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KFe2As2 单晶超导转变温度的静水压力和单轴压力依赖性
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
P. Canfield
中科院分区：
文献类型：
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作者：
S. Bud’ko;Yong Liu;T. Lograsso;P. Canfield
我们展示了压力高达 $ensuremath{sim}12$ kbar 时的热容量、$c$ 轴热膨胀以及与压力相关的低场、与温度相关的磁化强度，以及 KFe${}_{2}$As${}_{2}$ 单晶的数据。 ${T}_{c}$ 在压力下下降，$d{T}_{c}/dPensuremath{approx}ensuremath{-}0.10$ K/kbar。推断的单轴（$c$ 轴）压力导数为正，$d{T}_{c}/d{p}_{c}ensuremath{approx}0.11$ K/kbar。将数据与过掺杂铁基超导体的数据进行比较分析。有人认为，KFe${}_{2}$As${}_{2}$ 中的超导性可能与 122 系列中其他过掺杂的铁基材料不同。
We present heat capacity, $c$-axis thermal expansion and pressure-dependent, low-field, temperature-dependent magnetization for pressures up to $ensuremath{sim}12$ kbar, data for KFe${}_{2}$As${}_{2}$ single crystals. ${T}_{c}$ decreases under pressure with $d{T}_{c}/dPensuremath{approx}ensuremath{-}0.10$ K/kbar. The inferred uniaxial, $c$-axis, pressure derivative is positive, $d{T}_{c}/d{p}_{c}ensuremath{approx}0.11$ K/kbar. The data are analyzed in comparison with those for overdoped Fe-based superconductors. Arguments are presented that superconductivity in KFe${}_{2}$As${}_{2}$ may be different from the other overdoped, Fe-based materials in the 122 family.