Spin-flop and antiferromagnetic phases of the ferromagnetic half-twist ladder compounds Ba3Cu3In4O12 and Ba3Cu3Sc4O1
Author(s): Kumar, M; Dutton, SE; Cava, Robert J; Soos, ZG
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Abstract: | The title compounds have dominant ferromagnetic exchange interactions within one-dimensional (1D) half-twist ladders of s = 1/2 Cu{sup 2+} ions and antiferromagnetic (AFM) interactions between ladders, leading to ordered 3D phases at temperatures below 20 K. Here we show that a microscopic 1D model of the paramagnetic (PM) phase combined with a phenomenological model based on sublattice magnetization describes the observed temperature and field dependent magnetism. The model identifies AFM, spin-flop and PM phases whose boundaries have sharp features in the experimental magnetization M(T,H) and specific heat C{sub P}(T,H). Exact diagonalization of the 1D model, possible for 24 spins due to special structural features of half-twist ladders, yields the magnetization and spin susceptibility of the PM phase. AFM interactions between ladders are included at the mean-field level using the field, H{sub AF}, obtained from modelling the ordered phases. Isotropic exchange J{sub 1} =- 135 K and g-tensor g = 2.1 within ladders, plus exchange and anisotropy fields H{sub AF} and H{sub A}, describe the ordered phases and are almost quantitative for the PM phase. |
Publication Date: | 3-Apr-2013 |
Electronic Publication Date: | 5-Mar-2013 |
Citation: | Kumar, M, Dutton, SE, Cava, RJ, Soos, ZG. (2013). Spin-flop and antiferromagnetic phases of the ferromagnetic half-twist ladder compounds Ba3Cu3In4O12 and Ba3Cu3Sc4O1. Journal of Physics: Condensed Matter, 25 (13), 136004 - 136004. doi:10.1088/0953-8984/25/13/136004 |
DOI: | doi:10.1088/0953-8984/25/13/136004 |
ISSN: | 0953-8984 |
EISSN: | 1361-648X |
Pages: | 136004 - 136004 |
Type of Material: | Journal Article |
Journal/Proceeding Title: | Journal of Physics: Condensed Matter |
Version: | Author's manuscript |
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