arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1404.7233cond-mat.supr-con
收藏

铜氧化物和磷属元素化物高温超导体中的红外赝能隙

On infrared pseudogap in cuprate and pnictide high-temperature superconductors

S. J. Moon, Y. S. Lee, A. A. Schafgans, A. V. Chubukov, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda, M. A. Tanatar, R. Prozorov, A. Thaler, P. C. Canfie… 展开作者

S. J. Moon, Y. S. Lee, A. A. Schafgans, A. V. Chubukov, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda, M. A. Tanatar, R. Prozorov, A. Thaler, P. C. Canfield, S. L. Bud'ko, A. S. Sefat, D. Mandrus, K. Segawa, Y. Ando, D. N. Basov

摘要:

我们研究了典型的铜氧化物和磷属元素化物超导体YBa_2Cu_3O_y和BaFe_2As_2(Ba_(122))系统中赝能隙的红外表现。我们发现这两类超导体的赝能隙的光谱特征之间有显着的相似之处。在这两个系统中的赝能隙状态的标志包括在约500 cm-1处的弱吸收特征,随后在电导率数据中在500和1500 cm-1之间的无特征连续区,以及在低于700 - 900 cm-1的散射率中的显著抑制。后者的结果使我们能够识别与赝能隙$Δ_{PG}$相关的能量尺度。我们发现,在Ba_(122)基材料中,超导电性引起的红外光谱的变化发生在100 - 200 cm ~(-1)以下的频率范围内,远低于赝能隙的能级。我们进行了理论分析的散射率数据的两种化合物使用相同的模型,占的赝能隙和电子玻色子耦合的影响。我们发现,低于$Δ_{PG}$的Ba 122基化合物的散射率抑制是完全由于赝能隙的形成,而电子玻色子耦合效应的影响仅限于较低的频率。在我们的建模中作为输入的磁共振模式被发现与赝能隙的发展演变,这表明赝能隙和磁性之间的密切相关性。

英文摘要:

We investigate infrared manifestations of the pseudogap in the prototypical cuprate and pnictide superconductors: YBa2Cu3Oy and BaFe2As2 (Ba122) systems. We find remarkable similarities between the spectroscopic features attributable to the pseudogap in these two classes of superconductors. The hallmarks of the pseudogap state in both systems include a weak absorption feature at about 500 cm-1 followed by a featureless continuum between 500 and 1500 cm-1 in the conductivity data and a significant suppression in the scattering rate below 700 - 900 cm-1. The latter result allows us to identify the energy scale associated with the pseudogap $Δ_{PG}$. We find that in the Ba122-based materials the superconductivity-induced changes of the infrared spectra occur in the frequency region below 100 - 200 cm-1, which is much lower than the energy scale of the pseudogap. We performed theoretical analysis of the scattering rate data of the two compounds using the same model which accounts for the effects of the pseudogap and electron-boson coupling. We find that the scattering rate suppression in Ba122-based compounds below $Δ_{PG}$ is solely due to the pseudogap formation whereas the impact of the electron-boson coupling effects is limited to lower frequencies. The magnetic resonance modes used as inputs in our modeling are found to evolve with the development of the pseudogap, suggesting an intimate correlation between the pseudogap and magnetism.

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。

↑