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arXiv 1601.00829cond-mat.supr-con
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NaFe $_{1-x}$ Rh $_x$ As单晶的电阻率和霍尔效应研究

Combined resistivity and Hall effect study on NaFe$_{1-x}$Rh$_x$As single crystals

Frank Steckel, Robert Beck, Maria Roslova, Dirk Bombor, Igor Morozov, Sabine Wurmehl, Bernd Buechner, Christian Hess

摘要:

电输运测量被用来研究Rh掺杂的NaFeAs超导体系列,重点是四相。电阻率曲率具有反常的温度依赖性,证明在相图中散射率、有效质量以及载流子密度的变化的两个交叉区域。第一交叉区域直接连接到结构转变,并且类似于电阻率各向异性的开始。第二个交叉区域也可以从温度相关的霍尔系数推导出来。与文献NMR数据的比较表明,该区域与远高于四方晶系到正交相变的π涨落有关。

英文摘要:

Electrical transport measurements are used to study the Rh-doped NaFeAs superconductor series with a focus on the tetragonal phase. The resistivity curvature has an anomalous temperature dependence evidencing in the phase diagram two crossover regions of changes in the scattering rate, the effective mass as well as of the charge carrier density. The first crossover region is directly connected to the structural transition and resembles the onset of resistivity anisotropy. The second crossover region can as well be deduced from the temperature dependent Hall coefficient. A comparison to literature NMR data suggests this region to be connected with nematic fluctuations far above the tetragonal to orthorhombic phase transition.

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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