| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Raman phonon anomalies in Sr(Fe1-xCox)2As2 |
| Yanxing Yang(杨彦兴)1,2,†, Hewei Zhang(张鹤巍)2, and Haizheng Zhuang(庄海正)2 |
1 School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, China;
2 Department of Physics, New Jersey Institute of Technology, Newark 07102-1982, USA |
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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-xCox)2As2 (x=0 and x=0.04) single crystals in the B2g 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-xCox)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.
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Received: 20 May 2021
Revised: 18 June 2021
Accepted manuscript online: 21 June 2021
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PACS:
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74.25.Gz
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(Optical properties)
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74.25.Kc
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(Phonons)
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78.30.-j
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(Infrared and Raman spectra)
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74.62.Dh
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(Effects of crystal defects, doping and substitution)
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Corresponding Authors:
Yanxing Yang
E-mail: yy397@njit.edu
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Cite this article:
Yanxing Yang(杨彦兴), Hewei Zhang(张鹤巍), and Haizheng Zhuang(庄海正) Raman phonon anomalies in Sr(Fe1-xCox)2As2 2022 Chin. Phys. B 31 027401
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