Transient gap generation in BaFe2As2 driven by coherent lattice vibrations

Warshauer, Jacob A.; Bustamante Lopez, Daniel Alejandro; Dong, Qingxin; Chen, Genfu; Hu, Wanzheng

doi:10.1093/pnasnexus/pgad164

Title: Transient gap generation in BaFe₂As₂ driven by coherent lattice vibrations

Journal Article · 16 May 2023 · PNAS Nexus

DOI: https://doi.org/10.1093/pnasnexus/pgad164 · OSTI ID:1975895

Warshauer, Jacob A. ^[1]; Bustamante Lopez, Daniel Alejandro ^[1]; Dong, Qingxin ^[2]; Chen, Genfu ^[2];

^[1]

Boston University, MA (United States)
Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)

Iron-based superconductors provide a rich platform to investigate the interplay between unconventional superconductivity, nematicity, and magnetism. The electronic structure and the magnetic properties of iron-based superconductors are highly sensitive to the pnictogen height. Coherent excitation of the A_1g phonon by femtosecond laser directly modulates the pnictogen height, which has been used to control the physical properties of iron-based superconductors. Previous studies show that the driven A_1g phonon resulted in a transient increase of the pnictogen height in BaFe₂As₂⁠, favoring an enhanced Fe magnetic moment. However, there are no direct observations on either the enhanced Fe magnetic moments or the enhanced spin-density wave (SDW) gap. Here, we use time-resolved broadband terahertz spectroscopy to investigate the dynamics of BaFe₂As₂ in the A_1g phonon-driven state. Below the SDW transition temperature, we observe a transient gap generation at early-time delays. Here, a similar transient feature is observed in the normal state up to room temperature.

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Research Organization:: Boston Univ., MA (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); Strategic Priority Research Program (B) of Chinese Academy of Sciences; Ministry of Science and Technology of China

Grant/Contract Number:: SC0021305; 1944957; 11874417; 12274440; XDB33010100; 2022YFA1403903; SC-0021305

OSTI ID:: 1975895

Alternate ID(s):: OSTI ID: 1991240

Journal Information:: PNAS Nexus, Vol. 2, Issue 6; ISSN 2752-6542

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United States

Language:: English

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