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A-site deficient Pr0.6Sr0⋅4MnO3: Probing the magnetocaloric response through magnetic, electrical, and theoretical analyses
Authors: Dhahri, A.; Moualhi, Y.; Elleuch, F.; Dhahri, E.; Abdelmoula, N.
Ref.: J. Phys. Chem. Solids 209, 113328 (2026)
Abstract: The urgent need for sustainable and cost-efficient cooling technologies has intensified the exploration of manganite-based materials with promising magnetocaloric properties. In this study, we synthesized and analyzed three compositions: Pr0.6Sr0 & sdot;4MnO3 (S0), Pr0.6Sr0 & sdot;O30 & sdot;1MnO3 (S1), and Pr0.5O0 & sdot;1Sr0 & sdot;4MnO3 (S2), where ´O´ represents an A-site vacancy. By systematically introducing controlled deficiencies at the praseodymium or strontium sites, we investigated their influence on the magnetocaloric effect (MCE) and relative cooling power (RCP). All samples exhibited a pronounced MCE, with the praseodymium-deficient composition (S2) showing the most remarkable performance, achieving an RCP close to 54 % of that of pure gadolinium (Gd). To support the experimental observations, Landau theory was applied to the S1 sample, yielding predictions in excellent agreement with experimental data. Furthermore, the magnetic entropy change was reliably estimated from electrical transport measurements, underscoring the strong interplay between magnetic and electrical responses in these materials. These findings highlight A-site engineered Pr-Sr manganites as promising candidates for environmentally friendly magnetic refrigeration applications.
