论文标题
通过点接触光谱和核磁共振调查的pRFEAS（O，F）的超导性
Superconductivity of underdoped PrFeAs(O,F) investigated via point-contact spectroscopy and nuclear magnetic resonance
论文作者
论文摘要
prfeas（O，F）是1111个铁基超导体家族中鲜为人知的成员之一，通过运输，鱿鱼磁力计，核磁共振（NMR）测量和点接触Andreev-Andreev-Reflection-Reflection频谱（PCARS）进行了详细研究。对单晶的PCAR测量证明了PRFEAS（O，F）超导性的多图形性质，显示至少两个各向同性间隙，在光谱中明显可见，无论目前注射的方向如何（即沿着AB平面或沿C轴）。较高能量处的其他特征可以解释为强烈电子玻色子耦合的特征，如将Andreev反射与Eliashberg理论相结合的模型所证明的。正常相的磁共振测量表明，在不足的PRFEA（O，F）中缺乏磁性顺序，而$^{75} $作为NMR自旋晶格放松结果，表明存在明显的电子自旋波动，峰值峰值峰值峰值峰值峰值峰值{C {C} $，并且预计将介导超导电配对。
Underdoped PrFeAs(O,F), one of the less known members of the 1111 family of iron-based superconductors, was investigated in detail by means of transport, SQUID magnetometry, nuclear magnetic resonance (NMR) measurements and point-contact Andreev-reflection spectroscopy (PCARS). PCARS measurements on single crystals evidence the multigap nature of PrFeAs(O,F) superconductivity, shown to host at least two isotropic gaps, clearly discernible in the spectra, irrespective of the direction of current injection (i.e., along the ab planes or along the c axis). Additional features at higher energy can be interpreted as signatures of a strong electron-boson coupling, as demonstrated by a model which combines Andreev reflection with the Eliashberg theory. Magnetic resonance measurements in the normal phase indicate the lack of a magnetic order in underdoped PrFeAs(O,F), while $^{75}$As NMR spin-lattice relaxation results suggest the presence of significant electronic spin fluctuations, peaking above $T_{c}$ and expected to mediate the superconducting pairing.
