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- W2022387622 abstract "The magnetic susceptibilities of the two spin-textonehalf{} Heisenberg antiferromagnetic chain systems, 6-methyl-2-aminopyridinium trichlorocuprate(II) [(6MAP)Cu${mathrm{Cl}}_{3}$] and 3-methyl-2-aminopyridinium trichlorocuprate(II) [(3MAP)Cu${mathrm{Cl}}_{3}$], have been reinvestigated. Their behavior cannot be described by a simple uniform Heisenberg antiferromagnetic chain model at low temperature, but rather by either a spin-Peierls model with a paramagnetic impurity contribution or a broken-chain model. The spin-Peierls model assumes a uniform antiferromagnetic chain above the transition temperature and a weakly dimerized antiferromagnetic chain below that temperature and yields uniform-chain exchange constants $frac{J}{k}$ of -54.5 and -59 K for (6MAP)Cu${mathrm{Cl}}_{3}$ and (3MAP)Cu${mathrm{Cl}}_{3}$, respectively, with the alternating exchange ratio $0.98<ensuremath{alpha}<1$ for both. The possible spin-Peierls transition temperatures are about 2 K. It is also possible to explain the data by a broken-chain model which gives exchanges of -50.5 and -55.6 K for (6MAP)Cu${mathrm{Cl}}_{3}$ and (3MAP)Cu${mathrm{Cl}}_{3}$, respectively. In this model the average chain lengths of two compounds are estimated." @default.
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- W2022387622 title "Low-temperature susceptibilities of the quasi-one-dimensional spin-½ Heisenberg antiferromagnets (6MAP)Cu<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and (3MAP)Cu<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cl</mml:mi></mml:mrow…" @default.
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- W2022387622 doi "https://doi.org/10.1103/physrevb.52.15327" @default.
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