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arXiv 1003.3798cond-mat.supr-con
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SmFeAsO1-xFx(0.15 < x < 0.2)超导体中4f与巡游电子的耦合:NMR研究

Coupling between 4f and itinerant electrons in SmFeAsO1-xFx (0.15 < x < 0.2) superconductors: an NMR study

G. Prando, P. Carretta, A. Rigamonti, S. Sanna, A. Palenzona, M. Putti, M. Tropeano

摘要:

给出了$0.15\leq x\leq 0.2$在SmFeAsO $_{1-x}$ F $_x$中的$^{19}$ F NMR测量结果。核自旋晶格弛豫速率$1/T_1$增加冷却后的趋势类似于一个已经观察到的CeCu $_{5.2}$ Au $_{0.8}$,准二维重费米子金属间化合物与反铁磁基态。特别是,无论是在SmFeAsO $_{1-x}$ F $_x$或CeCu $_{5.2}$ Au $_{0.8}$的弛豫速率的行为可以在弱巡回电子系统的自洽重整化理论的框架内描述。值得注意的是,没有检测到超导转变对$^{19}$ F $1/T_1$的影响,这是一种很难用单带模型解释的现象。

英文摘要:

$^{19}$F NMR measurements in SmFeAsO$_{1-x}$F$_x$, for $0.15\leq x\leq 0.2$, are presented. The nuclear spin-lattice relaxation rate $1/T_1$ increases upon cooling with a trend analogous to the one already observed in CeCu$_{5.2}$Au$_{0.8}$, a quasi two-dimensional heavy-fermion intermetallic compound with an antiferromagnetic ground-state. In particular, the behaviour of the relaxation rate either in SmFeAsO$_{1-x}$F$_x$ or in CeCu$_{5.2}$Au$_{0.8}$ can be described in the framework of the self-consistent renormalization theory for weakly itinerant electron systems. Remarkably, no effect of the superconducting transition on $^{19}$F $1/T_1$ is detected, a phenomenon which can hardly be explained within a single band model.

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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