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arXiv 0905.4894cond-mat.supr-concond-mat.str-el
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Ba(Fe(1-x)TMx)2As 2(TM = Rh,Pd)单晶的Phase diagrams

Phase diagrams of Ba(Fe(1-x)TMx)2As2 (TM = Rh, Pd) single crystals

N. Ni, A. Thaler, A. Kracher, J. Q. Yan, S. L. Bud'ko, P. C. Canfield

摘要:

本文报道了Ba(Fe(1-x)TMx)_2As_2(TM = Rh,Pd)系列单晶的生长和结构、热力学和输运性质的研究。这些测量结果表明,结构/磁性相变,发现在纯BaFe_2As_2在134 K,被单调抑制的掺杂和超导电性可以稳定在一个圆顶状的区域。温度组成(T-x)相图的基础上的电输运和磁化强度的测量构建和比较的Ba(Fe(1-x)TMx)2As 2(TM = Co,Ni)系列。尽管3d和4d壳层之间的一般差异以及晶胞参数变化中的具体显著差异,但Rh掺杂的效果与Co掺杂的效果异常相似,Pd掺杂的效果与Ni掺杂的效果异常相似。这些数据表明,而结构/反铁磁相变温度可以参数化的x和超导转变温度可以参数化的一些组合的x和e,额外的电子数与TM掺杂,3d和4d掺杂的BaFe 2As 2的转变温度不能简单地参数化的变化,在晶胞尺寸或它们的比例。

英文摘要:

Single crystalline Ba(Fe(1-x)TMx)2As2 (TM = Rh, Pd) series have been grown and characterized by structural, thermodynamic and transport measurements. These measurements show that the structural/magnetic phase transitions, found in pure BaFe2As2 at 134 K, are suppressed monotonically by the doping and that superconductivity can be stablized over a dome-like region. Temperature-composition (T-x) phase diagrams based on electrical transport and magnetization measurements are constructed and compared to those of the Ba(Fe(1-x)TMx)2As2 (TM = Co, Ni) series. Despite the generic difference between 3d and 4d shells and the specific, conspicuous differences in the changes to the unit cell parameters, the effects of Rh doping are exceptionally similar to the effects of Co doping and the effects of Pd doping are exceptionally similar to the effects of Ni doping. These data show that whereas the structural / antiferromagnetic phase transition temperatures can be parameterized by x and the superconducting transition temperature can be parameterized by some combination of x and e, the number of extra electrons associated with the TM doping, the transition temperatures of 3d- and 4d- doped BaFe2As2 can not be simply parameterized by the changes in the unit cell dimensions or their ratios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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