Optical properties of FeAs-based parent compound:
A comparative study for polycrystalline EuFe 2 As 2 and LaFeAsO

doi:10.1007/s11467-009-0044-4

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Front. Phys. ›› 2009, Vol. 4 ›› Issue (4) : 459-463. DOI: 10.1007/s11467-009-0044-4

Research articles

Optical properties of FeAs-based parent compound: A comparative study for polycrystalline EuFe 2 As 2 and LaFeAsO

Wan-zheng HU (胡婉铮)¹,Jing DONG (董靖)¹,Gang LI (李岗)¹,Zheng LI (李政)¹,Ping ZHENG (郑萍)¹,Gen-fu CHEN (陈根富)¹,Jian-lin LUO (雒建林)¹,Nan-lin WANG (王楠林)¹, ²,

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Abstract

We report on a comparative optical investigation on EuFe₂As₂ and LaFeAsO polycrystalline samples. The spin-density wave (SDW) partial gap is observed for both compounds. The gap-like absorption peaks in the real part of conductivity for EuFe₂As₂ and LaFeAsO scale with their respective TSDW. Most remarkably, the study reveals a substantial difference in optical reflectance spectra for the two prototype compounds of 122 and 1111 systems: EuFe₂As₂ shows a much higher reflectivity with fewer phonon modes than that of LaFeAsO. This yields optical evidence for much stronger anisotropy between ab-plane and c-axis in 1111-type compounds.

Keywords

FeAs-based superconductor / optical properties / spin-density wave

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Wan-zheng HU (胡婉铮), Jing DONG (董靖), Gang LI (李岗), Zheng LI (李政), Ping ZHENG (郑萍), Gen-fu CHEN (陈根富), Jian-lin LUO (雒建林), Nan-lin WANG (王楠林). Optical properties of FeAs-based parent compound: A comparative study for polycrystalline EuFe 2 As 2 and LaFeAsO. Front. Phys., 2009, 4(4): 459‒463 https://doi.org/10.1007/s11467-009-0044-4