Metal-insulator transition in (Pr, Y)0.7Ca0.3CoO3 in the far-infrared spectral region

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F20%3A00536507" target="_blank" >RIV/61388980:_____/20:00536507 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/20:00536507 RIV/00216208:11310/20:10417899

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevB.102.195105" target="_blank" >https://doi.org/10.1103/PhysRevB.102.195105</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.102.195105" target="_blank" >10.1103/PhysRevB.102.195105</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Metal-insulator transition in (Pr, Y)0.7Ca0.3CoO3 in the far-infrared spectral region

Popis výsledku v původním jazyce

Bulk ceramics and thick nanogranular films of mixed-valence cobaltite (Pr1−yYy)0.7Ca0.3CoO3 were studied using time-domain THz transmission spectroscopy and infrared reflection spectroscopy. The terahertz conductivity spectrum shows that the transition is not a simple cross-over between two states. As the charges become delocalized during the insulator to metal transition, a broad resonant mode corresponding to the eigenfrequency of the binding potential appears in the terahertz conductivity spectra in the ceramics, and it further softens as the metallic state prevails. This is a consequence of the complexity of charge motion in a temperature-dependent energy landscape, changing from the tightly bound charges on atomic distance in the insulating phase to almost free charges in the metallic phase. The insulator to metal transition is also accompanied by a weak softening of infrared-active phonon modes, which is related to the expansion of lattice parameters upon phase transition.n

Název v anglickém jazyce

Metal-insulator transition in (Pr, Y)0.7Ca0.3CoO3 in the far-infrared spectral region

Popis výsledku anglicky

Bulk ceramics and thick nanogranular films of mixed-valence cobaltite (Pr1−yYy)0.7Ca0.3CoO3 were studied using time-domain THz transmission spectroscopy and infrared reflection spectroscopy. The terahertz conductivity spectrum shows that the transition is not a simple cross-over between two states. As the charges become delocalized during the insulator to metal transition, a broad resonant mode corresponding to the eigenfrequency of the binding potential appears in the terahertz conductivity spectra in the ceramics, and it further softens as the metallic state prevails. This is a consequence of the complexity of charge motion in a temperature-dependent energy landscape, changing from the tightly bound charges on atomic distance in the insulating phase to almost free charges in the metallic phase. The insulator to metal transition is also accompanied by a weak softening of infrared-active phonon modes, which is related to the expansion of lattice parameters upon phase transition.n

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

—

Svazek periodika

102

Číslo periodika v rámci svazku

19

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

1-13

Kód UT WoS článku

000584336200002

EID výsledku v databázi Scopus

2-s2.0-85096312598