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 present the study of magnetization, thermal expansion, specific heat,resistivity, and a.c. susceptibility of(Pr$_{1-y}$Eu$_y$)$_{0.7}$Ca$_{0.3}$CoO$_3$ cobaltites. The measurements wereperformed on ceramic samples with $y = 0.12 - 0.26$ and $y = 1$. Based on theseresults, we construct the phase diagram, including magnetic and spin-statetransitions. The transition from the low- to intermediate-spin state isobserved for the samples with $y > 0.18$, whereas for a lower Eu-doping level,there are no spin-state transitions, but a crossover between the ferromagneticand paramagnetic states occurs. The effect of oxygen isotope substitution alongwith Eu doping on the magnetic/spin state is discussed. The oxygen-isotopesubstitution ($^{16}$O by $^{18}$O) is found to shift both the magnetic andspin-state phase boundaries to lower Eu concentrations. The isotope effect onthe spin-state transition temperature ($y > 0.18$) is rather strong, but it ismuch weaker for the transition to a ferromagnetic state ($y < 0.18$). Theferromagnetic ordering in the low-Eu doped samples is shown to be promoted bythe Co$^{4+}$ ions, which favor the formation of the intermediate-spin state ofneighboring Co$^{3+}$ ions.

Phase diagram and isotope effect in (PrEu)_0.7Ca_0.3CoO_3 cobaltites exhibiting spin-state transitions