Theoretical and experimental magnetic specific heat of CsMn<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>· 2<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>O

Detailed specific-heat measurements between 1.1 and 52 K on the $S=\frac{5}{2}$ Heisenberg linear-chain system CsMn${\mathrm{Cl}}_{3}$ \ifmmode\cdot\else\textperiodcentered\fi{} 2${\mathrm{H}}_{2}$O are reported. The results could be interpreted with the aid of newly developed theoretical estimates for the magnetic contribution and a lattice contribution characteristic for a chemically layered compound. A value of $\frac{J}{k}=\ensuremath{-}3.3\ifmmode\pm\else\textpm\fi{}0.3$ K is obtained, which will be compared with the results from other studies.

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