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Dominant ferromagnetism in the spin-1/2 half-twist ladder 334 compounds, Ba3Cu3In4O12 and Ba3Cu3Sc4O12

Author(s): Dutton, SE; Kumar, M; Soos, ZG; Broholm, CL; Cava, Robert J

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Abstract: The magnetic properties of polycrystalline samples of Ba3Cu3In4O12 (In-334) and Ba3Cu3Sc4O12 (Sc-334) are reported. Both 334 phases have a structure derived from perovskite, with CuO4 squares interconnected to form half-twist ladders along the c-axis. The Cu–O–Cu angles, ∼90°, and the positive Weiss temperatures indicate the presence of significant ferromagnetic (FM) interactions along the Cu ladders. At low temperatures, T < 20 K, sharp transitions in the magnetic susceptibility and heat capacity measurements indicate three-dimensional (3D) antiferromagnetic (AFM) ordering at TN. TN is suppressed on application of a field and a complex magnetic phase diagram with three distinct magnetic regimes below the upper critical field can be inferred from our measurements. The magnetic interactions are discussed in relation to a modified spin-1/2 FM–AFM model and the 334 half-twist ladder is compared to other two-rung ladder spin-1/2 systems.
Publication Date: 26-Mar-2012
Electronic Publication Date: 26-Mar-2012
Citation: Dutton, SE, Kumar, M, Soos, ZG, Broholm, CL, Cava, RJ. (2012). Dominant ferromagnetism in the spin-1/2 half-twist ladder 334 compounds, Ba3Cu3In4O12 and Ba3Cu3Sc4O12. Journal of Physics: Condensed Matter, 24 (16), 166001 - 166001. doi:10.1088/0953-8984/24/16/166001
DOI: doi:10.1088/0953-8984/24/16/166001
ISSN: 0953-8984
EISSN: 1361-648X
Pages: 166001 - 166001
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Physics: Condensed Matter
Version: Author's manuscript



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