Magnetic Phase Transition in the Quasi-One-Dimensional Spin Chain System Fe_0.75Cu_0.25NbO₄.

ABSTRACT: In the present work, we conducted a comprehensive study using multiple experimental techniques to elucidate the structural, charge-state, vibrational, and magnetic properties of the quasi-one-dimensional spin chain system Fe_0.75Cu_0.25NbO₄. We found that substituting Fe³⁺ (3d⁵, s = 5/2) with Cu²⁺ (3d⁹, s = 1/2) induces significant changes in the lattice parameters, mixed valence states of Cu (Cu²⁺ and Cu¹⁺), and oxygen vacancies, as well as a ferrimagnetic (FiM) ordered state at room temperature. The FiM state is supported by double-exchange interactions between Fe³⁺ and Cu²⁺, mediated by oxygen, which highlight the magnetization mechanism and help describe the complex ma

SUBMITTER: Evaristo DDS 

PROVIDER: S-EPMC12756793 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature