Magnetostructural Transition in Spin Frustrated Halide Double Perovskites.

ABSTRACT: Geometrical frustration in the face-centered-cubic (fcc) lattice presents a fundamental challenge in determining antiferromagnetic order, as the ground state is highly sensitive to subtle differences in competing magnetic interactions and structural symmetry. Here, we explore the magnetostructural interplay in two halide double perovskites, Cs₂NaFeCl₆ and Cs₂AgFeCl₆. Although both materials have a cubic structure at room temperature, neutron diffraction shows that they adopt different antiferromagnetic structures upon cooling. Cs₂NaFeCl₆ experiences a transition to an AFM-III order below 2.6 K, governed by J ₁ and J ₂ (first and second nearest-neighbor) magnetic exchange interactions. Cs

SUBMITTER: Mopoung K 

PROVIDER: S-EPMC12461833 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature