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 the optical conductivity of Sr$_{1-x}$Ca$_x$RuO$_3$ across theferromagnetic to paramagnetic transition that occurs at $x=0.8$. The thin filmswere grown by metalorganic aerosol deposition with $0 \leq x \leq 1$ ontoNdGaO$_3$ substrates. We performed THz frequency domain spectroscopy in afrequency range from 3~cm$^{-1}$ to 40~cm$^{-1}$ (100~GHz to 1.4~THz) and attemperatures ranging from 5~K to 300~K, measuring transmittivity and phaseshift through the films. From this we obtained real and imaginary parts of theoptical conductivity. The end-members, ferromagnetic SrRuO$_3$ and paramagneticCaRuO$_3$, show a strongly frequency-dependent metallic response attemperatures below 20~K. Due to the high quality of these samples we can accesspronounced intrinsic electronic contributions to the optical scattering rate,which at 1.4~THz exceeds the residual scattering rate by more than a factor ofthree. Deviations from a Drude response start at about 0.7~THz for bothend-members in a remarkably similar way. For the intermediate members a higherresidual scattering originating in the compositional disorder leads to afeatureless optical response, instead. The relevance of low-lying interbandtransitions is addressed by a calculation of the optical conductivity withindensity functional theory in the local density approximation (LDA).

THz conductivity of Sr$_{1-x}$Ca$_x$RuO$_3$