English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate coherent phonon oscillations of BaFe$_2$As$_2$ using opticalpump-probe spectroscopy. Time-resolved optical reflectivity shows periodicmodulations due to $A_{1g}$ coherent phonon of $c$-axis arsenic vibrations.Optical probe beams polarized along the orthorhombic $a$- and $b$-axes revealthat the initial phase of coherent oscillations shows a systematic deviation asa function of temperature, although these oscillations arise from the same$c$-axis arsenic vibrations. The oscillation-phase remains anisotropic even inthe tetragonal structure, reflecting a nematic response of BaFe$_2$As$_2$. Ourstudy suggests that investigation on the phase of coherent phonon oscillationsin optical reflectivity can offer unique evidence of a nematic order stronglycoupled to a lattice instability.

Nematic response revealed by coherent phonon oscillations in BaFe$_2$As$_2$