Электронный каталог

Статья

Dang, N.T.
Strong Local Structural Distortion and Magnetic Order Suppression in Spin-Driven Multiferroic BaYFeO&sub(4) upon Co Doping / N.T.Dang, D.P.Kozlenko, S.E.Kichanov, E.A.Korneeva, V.T.Nguyen, A.V.Rutkauskas, [a.o.]. – Text : electronic // Journal of the American Ceramic Society. – 2025. – Vol. 109, No. 1. – P. e70385. – URL: https://doi.org/10.1111/jace.70385. – Bibliogr.: 56.

Understanding the interplay between structural, electronic, and magnetic properties is essential for unraveling the unique magnetic phenomena and spin-driven ferroelectricity in BaYFeO&sub(4) and related compounds. Herein, we present a comprehensive study on the effects of cobalt doping on the structural, electronic, and magnetic properties of BaYFe&sub(1−x)Co&sub(x)O&sub(4) polycrystals (x = 0–0.15), using a combination of X-ray and neutron powder diffraction, Raman spectroscopy, X-ray photoemission spectroscopy, and magnetic measurements. The initial orthorhombic Pnma crystal structure remains stable upon Co doping, though local structural changes arise due to the complex spin states of Co&sup(3+) ions. These ions adopt low-spin and high-spin configurations depending on their coordination, respectively, while Fe&sup(3+) ions retain a high-spin state. All samples exhibit an incommensurate collinear spin-density wave antiferromagnetic order at the Néel temperature T&sub(N1), which, evolves into a cycloidal antiferromagnetic order at a lower T&sub(N2). These long-range magnetic orders are gradually suppressed with increasing Co content. Additionally, the onset temperature of short-range magnetic correlations—emerging well above T&sub(N1)—decreases with increased doping. These findings highlight the significant influence of Co doping on both intrachain and interchain magnetic interactions, governing the overall magnetic behavior of BaYFe&sub(1−x)Co&sub(x)O&sub(4). The underlying mechanisms are discussed in detail.



ОИЯИ = ОИЯИ (JINR)2025