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B-Site Cu<sup>2</sup><sup>+</sup> Substitution and Strain-Mediated Magnetic Evolution in La<sub>2</sub>CoRuO<sub>6</sub> Double Perovskite: Insights from Experiment and DFT + U-Corrected Calculations.

ABSTRACT: Understanding the magnetic ground states of double perovskites remains complex due to competing exchange interactions, spin-orbit coupling, and structural disorder. This study explores the substitution of Cu2+ for Co2+ in La2CoRuO6 (LCRO), integrating experimental and DFT methods to probe the structural and electronic effects influencing magnetism. Pristine LCRO exhibits a monoclinic P21/c phase with dominant antiferromagnetic (AFM) Co2+-O-Ru4+ interactions. Low-level Cu2+ substitution (x = 0.05 and 0.3) induces a strain-driven transformation to a tetragonal I4/m phase, introducing structural inhomogeneity and mixed valence states. These lead to competing ferromagnetic (FM) interactions (Cu2+-O-Ru4+/Cu2+), while AFM order partially persists at x = 0.3 due to orbital asymmetry and strain effects. Magnetic measurements and DFT calculations show a Néel temperature (TN) shift from 28.7 to 39.8 K (x = 0.05), and emerging FM behavior at 19.2 K. At x = 0.3, AFM suppression and a Curie temperature (TC) of 36.5 K reveal dominant FM pathways. Finite-size corrected Curie-Weiss analysis highlights the role of strain and particle size in modulating magnetic properties and restoring intrinsic behavior in larger particles.

SUBMITTER: Nqayi S 

PROVIDER: S-EPMC12754751 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature

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B-Site Cu&lt;sup&gt;2&lt;/sup&gt;&lt;sup&gt;+&lt;/sup&gt; Substitution and Strain-Mediated Magnetic Evolution in La&lt;sub&gt;2&lt;/sub&gt;CoRuO&lt;sub&gt;6&lt;/sub&gt; Double Perovskite: Insights from Experiment and DFT + U-Corrected Calculations.

Nqayi Sibusiso S   Sondezi Buyisiwe B  

ACS applied materials & interfaces 20251215 51

Understanding the magnetic ground states of double perovskites remains complex due to competing exchange interactions, spin-orbit coupling, and structural disorder. This study explores the substitution of Cu<sup>2</sup><sup>+</sup> for Co<sup>2</sup><sup>+</sup> in La<sub>2</sub>CoRuO<sub>6</sub> (LCRO), integrating experimental and DFT methods to probe the structural and electronic effects influencing magnetism. Pristine LCRO exhibits a monoclinic <i>P</i>2<sub>1</sub>/<i>c</i> phase with domin  ...[more]

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