Электронный каталог

Статья

Lanovsky, R.
Interplay Between Crystal Structure, Magnetic and Electrotransport Properties in Anion-Deficient La&sub(1-x)Sr&sub(x)Co&sub(1-y)Ni&sub(y)O&sub(3-*g) / R.Lanovsky, V.Efimov, V.Sikolenko, [a.o.] // Physical Review Materials [Electronic resource]. – 2024. – Vol. 8, No. 11. – P. 114422. – URL: https://doi.org/10.1103/PhysRevMaterials.8.114422.

High-resolution neutron powder diffraction, magnetometry, and electrotransport measurements were used to investigate the crystal and magnetic structures of La&sub(1−𝑥)⁢Sr&sub(𝑥)⁢Co&sub(1−𝑦)⁢Ni&sub(𝑦)⁢O&sub(3−𝛾) perovskites within the temperature range of 4 to 300 K, along with their magnetic and transport properties. The symmetry of La&sub(1−𝑥)⁢Sr&sub(𝑥)⁢Co&sub(1−𝑦)⁢Ni&sub(𝑦)⁢O&sub(3−𝛾) was identified as monoclinic 𝐼⁢2/𝑎. In contrast to models positing gradual spin-state transitions of Co&sup(3+) ions from low-spin (LS) to intermediate-spin (IS) and/or high-spin (HS) states, our proposed model asserts that Co&sup(3+) ions predominantly adopt the IS state for all Sr&sup(2+) and Ni&sup(2+) substitution levels within the investigated temperature range. Consequently, the observed transition from a semiconducting spin glass to a metallic ferromagnetic state with increasing substitution levels can be attributed to a gradual decrease in the degree of monoclinic distortions, shortening of Co–O bond lengths and straightening of Co–O–Co bond angles, enhancing the overlap between Co&sup(3+)𝑑 and O&sup(2−)𝑝 orbitals.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 342 г1 - Замедление и диффузия нейтронов. Дифракция
Бюллетени = 9/025