Direct observation of double exchange in ferromagnetic La0.7Sr0.3CoO3 by broadband ellipsometry

FRIŠ, Pavel, Dominik MUNZAR, Ondřej CAHA and Adam DUBROKA. Direct observation of double exchange in ferromagnetic La0.7Sr0.3CoO3 by broadband ellipsometry. Physical Review B. College PK: AMER PHYSICAL SOC, 2018, vol. 97, No 4, p. "045137-1"-"045137-5", 5 pp. ISSN 2469-9950. Available from: https://dx.doi.org/10.1103/PhysRevB.97.045137.

Basic information

• Original name: Direct observation of double exchange in ferromagnetic La0.7Sr0.3CoO3 by broadband ellipsometry
• Authors: FRIŠ, Pavel (203 Czech Republic, belonging to the institution), Dominik MUNZAR (203 Czech Republic, belonging to the institution), Ondřej CAHA (203 Czech Republic, belonging to the institution) and Adam DUBROKA (203 Czech Republic, guarantor, belonging to the institution).
• Edition: Physical Review B, College PK, AMER PHYSICAL SOC, 2018, 2469-9950.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10302 Condensed matter physics
• Country of publisher: United States of America
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 3.736
• RIV identification code: RIV/00216224:14310/18:00102276
• Organization unit: Faculty of Science
• Doi: http://dx.doi.org/10.1103/PhysRevB.97.045137
• UT WoS: 000423339000005
• Keywords in English: double exchange; ellipsometry; ferromagnetic cobaltites; La0.7Sr0.3CoO3
• Tags: rivok
• Tags: International impact, Reviewed

Abstract

We present results of our broadband ellipsometry measurements of the optical response of ferromagnetic La0.7Sr0.3CoO3. Our data show that the ferromagnetic transition is accompanied by a transfer of optical spectral weight from an absorption band centered at 1.5 eV to a narrow component of the Drude-like peak. The associated reduction of the intraband kinetic energy is significantly larger than k(B)T(c), confirming that the double exchange plays a major role in the ferromagnetism of doped cobaltites. In conjunction with results of recent theoretical studies, the temperature dependence of the Drude-like peak suggests that the double exchange is mediated by t(2g) orbitals.

Links

• LM2015041, research and development project: Name: CEITEC Nano

Investor: Ministry of Education, Youth and Sports of the CR

• LQ1601, research and development project: Name: CEITEC 2020 (Acronym: CEITEC2020)

Investor: Ministry of Education, Youth and Sports of the CR

• MUNI/A/1291/2017, interní kód MU: Name: Struktura, elektronová struktura a optická odezva pokročilých materiálů VII

Investor: Masaryk University, Category A

• MUNI/A/1310/2016, interní kód MU: Name: Struktura, elektronová struktura a optická odezva pokročilých materiálů VI

Investor: Masaryk University, Category A