Phase transition in Pr0.5Ca0.5CoO3 and related cobaltites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F13%3A10191373" target="_blank" >RIV/00216208:11310/13:10191373 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/13:00423009

Výsledek na webu

<a href="http://link.springer.com/article/10.1140%2Fepjb%2Fe2013-30653-y" target="_blank" >http://link.springer.com/article/10.1140%2Fepjb%2Fe2013-30653-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjb/e2013-30653-y" target="_blank" >10.1140/epjb/e2013-30653-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Phase transition in Pr0.5Ca0.5CoO3 and related cobaltites

Popis výsledku v původním jazyce

We present an extensive investigation (magnetic, electric and thermal measurements and X-ray absorption spectroscopy) of the Pr0.5Ca0.5CoO3 and (Pr1-yYy)(0.7)Ca0.3CoO3 (y = 0.0625-0.15) perovskites, in which a peculiar metal-insulator (M-I) transition, accompanied with pronounced structural and magnetic anomalies, occurs at 76 K and 40-132 K, respectively. The inspection of the M-I transition using the XANES data of Pr-L-3-edge and Co-K-edge proofs the presence of Pr4+ ions at low temperatures and indicates simultaneously the intermediate spin to low spin crossover of Co species on lowering the temperature. The study thus definitively confirms the synchronicity of the electron transfer between Pr3+ ions and Co3+/O-4+(3) subsystem and the transition tothe low-spin, less electrically conducting phase. The large extent of the transfer is evidenced by the good quantitative agreement of the determined amount of the Pr4+ species, obtained either from the temperature dependence of the XANES

Název v anglickém jazyce

Phase transition in Pr0.5Ca0.5CoO3 and related cobaltites

Popis výsledku anglicky

We present an extensive investigation (magnetic, electric and thermal measurements and X-ray absorption spectroscopy) of the Pr0.5Ca0.5CoO3 and (Pr1-yYy)(0.7)Ca0.3CoO3 (y = 0.0625-0.15) perovskites, in which a peculiar metal-insulator (M-I) transition, accompanied with pronounced structural and magnetic anomalies, occurs at 76 K and 40-132 K, respectively. The inspection of the M-I transition using the XANES data of Pr-L-3-edge and Co-K-edge proofs the presence of Pr4+ ions at low temperatures and indicates simultaneously the intermediate spin to low spin crossover of Co species on lowering the temperature. The study thus definitively confirms the synchronicity of the electron transfer between Pr3+ ions and Co3+/O-4+(3) subsystem and the transition tothe low-spin, less electrically conducting phase. The large extent of the transfer is evidenced by the good quantitative agreement of the determined amount of the Pr4+ species, obtained either from the temperature dependence of the XANES

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/GAP204%2F11%2F0713" target="_blank" >GAP204/11/0713: Přenos náboje mezi ionty transitivních kovů a vzácných zemin v perovskitech</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

European Physical Journal B

ISSN

1434-6028

e-ISSN

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Svazek periodika

86

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

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Kód UT WoS článku

000322175100009

EID výsledku v databázi Scopus

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