Transition from the diamagnetic insulator to ferromagnetic metal in La1-xSrxCoO3.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F10%3A00353298" target="_blank" >RIV/68378271:_____/10:00353298 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Transition from the diamagnetic insulator to ferromagnetic metal in La1-xSrxCoO3.

Popis výsledku v původním jazyce

We have analyzed, using the theoretical GGA+U calculations, different configurations of spin states (LS, IS and HS Co3+) and proposed a model that accounts for magnetic and electric transport properties of perovskite cobaltites upon doping by charge carriers. In particular, it appears that the compositional transition from the diamagnetic LS phase of LaCoO3 to the ferromagnetic metallic IS phase in La1-xSrxCoO3 (x > 0.2) involves the same mechanisms as the high-temperature transition in pure LaCoO3. Theprocess occurs gradually via a phase-separated state, where metallic IS domains stabilized through a charge transfer between Co4+ and Co3+ neighbors coexist with the Co4+ poor regions in the LS ground state (or, at higher temperatures, in mixed LS/HS state). This phase separation vanishes when doping in La1-xSrxCoO3 reaches x 0.2, and a uniform IS phase, analogous to that in pure LaCoO3 in the high-temperature limit, is established.

Název v anglickém jazyce

Transition from the diamagnetic insulator to ferromagnetic metal in La1-xSrxCoO3.

Popis výsledku anglicky

We have analyzed, using the theoretical GGA+U calculations, different configurations of spin states (LS, IS and HS Co3+) and proposed a model that accounts for magnetic and electric transport properties of perovskite cobaltites upon doping by charge carriers. In particular, it appears that the compositional transition from the diamagnetic LS phase of LaCoO3 to the ferromagnetic metallic IS phase in La1-xSrxCoO3 (x > 0.2) involves the same mechanisms as the high-temperature transition in pure LaCoO3. Theprocess occurs gradually via a phase-separated state, where metallic IS domains stabilized through a charge transfer between Co4+ and Co3+ neighbors coexist with the Co4+ poor regions in the LS ground state (or, at higher temperatures, in mixed LS/HS state). This phase separation vanishes when doping in La1-xSrxCoO3 reaches x 0.2, and a uniform IS phase, analogous to that in pure LaCoO3 in the high-temperature limit, is established.

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/IAA100100611" target="_blank" >IAA100100611: Magnetismus a přechod izolátor-kov v Co3+/Co4+ perovskitech.</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

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

Název periodika

Journal of Magnetism and Magnetic Materials

ISSN

0304-8853

e-ISSN

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Svazek periodika

322

Číslo periodika v rámci svazku

9-12

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

3

Strana od-do

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Kód UT WoS článku

000275746100049

EID výsledku v databázi Scopus

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