Electrodynamics of electron doped iron-pnictide superconductors: Normal   state properties

N. Bari\v{s}i\'c; D. Wu; M. Dressel; L. J. Li; G. H. Cao; and Z. A. Xu

arXiv:1004.1658·cond-mat.supr-con·October 22, 2010

Electrodynamics of electron doped iron-pnictide superconductors: Normal state properties

N. Bari\v{s}i\'c, D. Wu, M. Dressel, L. J. Li, G. H. Cao, and Z. A. Xu

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TL;DR

This study investigates the electrodynamic properties of electron-doped iron-pnictide superconductors, revealing a hidden Fermi-liquid behavior, mass enhancement, and spectral weight transfer through reflectivity measurements.

Contribution

It provides detailed optical conductivity analysis showing Fermi-liquid behavior and mass enhancement in electron-doped BaFe2As2 superconductors, with insights into their normal state properties.

Findings

01

T^2 dependence of resistivity indicating Fermi-liquid behavior

02

Mass enhancement factor of approximately 5 from extended Drude analysis

03

Spectral weight shifts to lower energies upon cooling

Abstract

The electrodynamic properties of Ba(Fe $_{0.92}$ Co $_{0.08})_{2}$ As $_{2}$ and Ba(Fe $_{0.95}$ Ni $_{0.05})_{A} s$ _{2} $s in g l ecr y s t a l s ha v e b ee nin v es t i g a t e d b y r e f l ec t i v i t y m e a s u r e m e n t s ina w i d e f r e q u e n cy r an g e . I n t h e m e t a l l i cs t a t e, t h eo pt i c a l co n d u c t i v i t y co n s i s t so f ab r o a d in co h er e n t ba c k g r o u n d an d ana r r o w D r u d e - l ik eco m p o n e n tw hi c h d e t er min es t h e t r an s p or tp r o p er t i es; o n l y t h e l a tt er co n t r ib u t i o n s t r o n g l y d e p e n d so n t h eco m p os i t i o nan d t e m p er a t u r e . T hi ss u b sy s t e m r e v e a l s a$ T^2 $b e ha v i or in t h e d cr es i s t i v i t y an d sc a tt er in g r a t e d i sc l os in g ahi dd e n F er mi - l i q u i d b e ha v i or in t h e 122 i r o n - p ni c t i d e f ami l y . A n e x t e n d e d D r u d e ana l y s i sy i e l d s t h e f r e q u e n cy d e p e n d e n ceo f t h ee f f ec t i v e ma ss (w i t h$ m^*/m_b\approx 5$ in the static limit) and scattering rate that does not disclose a simple power law. The spectral weight shifts to lower energies upon cooling; a significant fraction is not recovered…

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