Raman phonon anomalies in Sr(Fe1-x Cox )2As2

Document Type

Article

Publication Date

1-1-2022

Abstract

Phonon anomalies have been reported in iron-pnictide superconductors indicating a diverse interplay between different orders in the materials. Here, we report Raman scattering measurements on Sr(Fe1-x Co x )2As2 (x = 0 and x = 0.04) single crystals in the B 2g symmetry with respect to a 1 Fe unit cell. Upon cooling, we observe a larger split (13 cm-1) of Eg Raman phonon modes pertaining to in-plane Fe and As displacements as the crystals undergo the tetragonal-to-orthorhombic structural phase transition, although a considerable split (9 cm-1) has been reported in Ba(Fe1-x Co x )2As2. Furthermore, the splitting of Eg phonon modes is strongly reduced upon doping. We perform an order-parameter analysis revealing a similar doping dependence of Eg phonon splitting as reported in other compounds of the 122 family, indicating these phonon anomalies widely exist in 122 iron-based superconductors and might share the same mechanisms.

Identifier

85124200647 (Scopus)

Publication Title

Chinese Physics B

External Full Text Location

https://doi.org/10.1088/1674-1056/ac0cd6

e-ISSN

20583834

ISSN

16741056

Issue

2

Volume

31

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