arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.6440cond-mat.supr-con
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等价掺杂BaFe PDMATHAAB(As $_{1-x}$ P $_x$)$_2$的面间电阻率

Inter-plane resistivity of isovalent doped BaFe$_2$(As$_{1-x}$P$_x$)$_2$

M. A. Tanatar, K. Hashimoto, S. Kasahara, T. Shibauchi, Y. Matsuda, R. Prozorov

摘要:

测量了铁基超导体BaFe $_2$(As $_{1-x}$ P $_x$)$_2$在从$x$ =0到$x$ =0.60的宽等电子磷取代范围内,从非超导母体化合物到重掺杂$T_c\approx 10 K$的超导组合物的随温度变化的面间电阻率$ρ_c(T)$。由于结构和磁性转变的功能,清楚地解决了在$ρ_c(T)$的欠掺杂晶体。在$ρ_c(T)$的特征最大值,发现在母体BaFe $_2$作为$_2$在200 K左右,迅速移动与磷替代高温。在最佳掺杂下,面间电阻率显示$T$ -线性温度依赖性,没有任何交叉异常,类似于先前报道的面内电阻率。该观察结果与在电子掺杂的Ba(Fe $_{1-x}$ Co $_x$)$_2$ As $_2$中在最佳掺杂时发现的不同温度依赖性形成鲜明对比。我们的发现表明,尽管电阻率和各向异性的值相似,温度依赖的正常状态下的传输是非常不同的电子和等电子掺杂的化合物。面内和面间折射率的温度依赖性相似,其中主要贡献来自费米表面的不同部分,表明散射在整个费米表面上是相同的。由于在准嵌套层上的磁涨落预计要强得多,这一观测结果可能指向不同层之间轨道间散射的重要性。

英文摘要:

Temperature-dependent inter-plane resistivity, $ρ_c(T)$, was measured for the iron-based superconductor BaFe$_2$(As$_{1-x}$P$_x$)$_2$ over a broad isoelectron phosphorus substitution range from $x$=0 to $x$=0.60, from non-superconducting parent compound to heavily overdoped superconducting composition with $T_c\approx 10 K$. The features due to structural and magnetic transitions are clearly resolved in $ρ_c(T)$ of the underdoped crystals. A characteristic maximum in $ρ_c(T)$, found in the parent BaFe$_2$As$_2$ at around 200 K, moves rapidly with phosphorus substitution to high temperatures. At the optimal doping, the inter-plane resistivity shows $T$-linear temperature dependence without any cross-over anomalies, similar to the previously reported in-plane resistivity. This observation is in stark contrast with dissimilar temperature dependences found at optimal doping in electron-doped Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$. Our finding suggests that despite similar values of the resistivity and its anisotropy, the temperature dependent transport in the normal state is very different in electron and isoelectron doped compounds. Similar temperature dependence of both in-plane and inter-plane resistivities, in which the dominant contributions are coming from different parts of the Fermi surface, suggests that scattering is the same on the whole Fermi surface. Since magnetic fluctuations are expected to be much stronger on the quasi-nested sheets, this observation may point to the importance of the inter-orbital scattering between different sheets.

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