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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present evidence for a concomitant structural and ferroelectrictransformation around $T_S\sim 360$ K in multiferroic BiFeO$_3$/LaAlO$_3$ thinfilms close to the tetragonal phase. Phonon excitations are investigated byusing Raman scattering as a function of temperature. The low-energy phononmodes at 180-260 cm$^{-1}$ related to the FeO$_6$ octahedron tilting showanomalous behaviors upon cooling through $T_S$; (i) a large hardening amountingto 15 cm$^{-1}$, (ii) an increase of intensity by one order of magnitude, and(iii) an appearance of a dozen new modes. In contrast, the high-frequency modesexhibit only weak anomalies. This suggests an intimate coupling of octahedrontilting to ferroelectricity leading to a simultaneous change of structural andferroelectric properties.

Anomalous low-energy phonons in nearly tetragonal BiFeO3 thin films