Электронный каталог

Статья

Dang, N.T.
Emergent Metamagnetism and Field-Induced Phase Separation in the Frustrated Antiferromagnet BaErFeO&sub(4) / N.T.Dang, D.P.Kozlenko, S.E.Kichanov, E.V.Lukin, A.V.Rutkauskas, [a.o.]. – Text : electronic // Physical Review B. – 2026. – Vol. 114, No. 3. – P. 034401. – URL: https://doi.org/10.1103/8wp3-3187. – Bibliogr.: 63.

A clear understanding of the physics of complex magnetic oxides is crucial for unlocking new pathways to design novel materials for technological applications. We present here a detailed investigation of the temperatureand magnetic-field-driven magnetic evolution of BaErFeO&sub(4) using a suite of complementary techniques, including neutron diffraction, Mössbauer spectroscopy, dc magnetization, and transverse susceptibility measurements. Below T&sub(N1) ≈ 50 K, the Fe sublattice orders into an incommensurate collinear spin-density-wave state with propagation vector k&sub(1) = (0, 0, ∼ 0.4). The 3d − 4 f exchange coupling drives a transition at T&sub(N2) ≈ 32 K to a commensurate noncollinear antiferromagnetic phase characterized by k&sub(2) = (0.5, 0, 0.5) involving ordering of both Fe&sup(3+) and Er&sup(3+) ions, followed by a further modification of the Er magnetic configuration below TN&sub(3) ≈ 5K governed by dominant 4 f − 4 f interactions. Strong geometrical frustration prevents complete long-range magnetic ordering, leaving a substantial fraction of spins in a short-range correlated state that serves as a metastable template for phase separation. Under an applied magnetic field of μ&sub(0)H ≈ 0.2 T, the Er&sup(3+) spins within these regions undergo a metamagnetic spin-flip transition, nucleating ferromagnetic clusters. This metamagnetic response remains fully reversible down to 8 K, while a crossover to an irreversible ferromagneticlike regime occurs at lower temperatures, attributed to kinetic arrest of the magnetic clusters. A complex field-induced phase separation is established, in which ferromagnetic clusters of distinct populations coexist with the long-range antiferromagnetic order of the Er sublattice. These findings underscore the complex interplay among magnetic anisotropy, magnetic frustration, and quenched disorder in stabilizing the magnetic ground state of BaErFeO&sub(4).



ОИЯИ = ОИЯИ (JINR)2026
Спец.(статьи,препринты) = С 326.3 - Ферми-системы. Спиновые системы