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arXiv 0905.4467cond-mat.supr-concond-mat.str-el
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欠掺杂磷属元素化合物中超导能隙和赝能隙的费米面二分法

Fermi surface dichotomy of the superconducting gap and pseudogap in underdoped pnictides

Y. -M. Xu, P. Richard, K. Nakayama, T. Kawahara, Y. Sekiba, T. Qian, M. Neupane, S. Souma, T. Sato, T. Takahashi, H. Luo, H. -H. Wen, G. -F. Chen, N. -L. Wang, … 展开作者

Y. -M. Xu, P. Richard, K. Nakayama, T. Kawahara, Y. Sekiba, T. Qian, M. Neupane, S. Souma, T. Sato, T. Takahashi, H. Luo, H. -H. Wen, G. -F. Chen, N. -L. Wang, Z. Wang, Z. Fang, X. Dai, H. Ding

摘要:

铁砷材料(磷属元素化物)在反铁磁相附近的高温超导性提高了自旋涨落介导配对的可能性。然而,反铁磁波动和超导性之间的相互作用仍然不清楚在欠掺杂制度,这是更接近反铁磁相。在这里,我们报告的超导能隙的欠掺杂磷属元素化物的比例与转变温度呈线性关系,并与SC间隙共存的一个明显的赝能隙欠掺杂的发展。这种赝能隙出现在由反铁磁波矢连接的费米表面片上,那里的超导配对也更强,这表明反铁磁涨落驱动了赝能隙和超导性。有趣的是,我们发现,赝隙和光谱线形随费米表面准嵌套条件的方式,共享相似的undergoded氧化铜超导体中观察到的双端-波腹二分行为的变化。

英文摘要:

High-temperature superconductivity in iron-arsenic materials (pnictides) near an antiferromagnetic phase raises the possibility of spin-fluctuation-mediated pairing. However, the interplay between antiferromagnetic fluctuations and superconductivity remains unclear in the underdoped regime, which is closer to the antiferromagnetic phase. Here we report that the superconducting gap of the underdoped pnictides scales linearly with the transition temperature, and that a distinct pseudogap coexisting with the SC gap develops on underdoping. This pseudogap occurs on Fermi surface sheets connected by the antiferromagnetic wavevector, where the superconducting pairing is stronger as well, suggesting that antiferromagnetic fluctuations drive both the pseudogap and superconductivity. Interestingly, we found that the pseudogap and the spectral lineshape vary with the Fermi surface quasi-nesting conditions in a fashion that shares similarities with the nodal-antinodal dichotomous behaviour observed in underdoped copper oxide superconductors.

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