Electronic correlations and unusual superconducting response in the optical properties of the iron chalcogenide FeTe0.55Se0.45

被引：69

作者：

Homes, C. C. ^{[1
]}

Akrap, A. ^{[1
]}

Wen, J. S. ^{[1
]}

Xu, Z. J. ^{[1
]}

Lin, Z. W. ^{[1
]}

Li, Q. ^{[1
]}

Gu, G. D. ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 18期

关键词：

T-C SUPERCONDUCTORS;

D O I：

10.1103/PhysRevB.81.180508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The in-plane complex optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45 have been determined above and below the critical temperature T-c=14 K. At room temperature the conductivity is described by a weakly interacting Fermi liquid; however, below 100 K the scattering rate develops a frequency dependence in the terahertz region, signaling the increasingly correlated nature of this material. We estimate the dc conductivity sigma(dc)(T >= T-c) similar or equal to 3500 +/- 400 Omega(-1) cm(-1) and the superfluid density rho(s0) similar or equal to 9 +/- 1 x 10(6) cm(-2), which places this material close to the scaling line rho(s0)/8 similar or equal to 8.1 sigma T-dc(c) for a BCS dirty-limit superconductor. Below T-c the optical conductivity reveals two gap features at Delta(1,2)similar or equal to 2.5 and 5.1 meV.

引用

页数：4

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