Theoretical and experimental magnetic specific heat of CsMnCl3· 2H2O

Detailed specific-heat measurements between 1.1 and 52 K on the $S=\frac{5}{2}$ Heisenberg linear-chain system CsMn${\mathrm{Cl}}_3$ · 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 $\frac{J}{k}=-3.3\mathrm{}\pm 0.3$ K is obtained, which will be compared with the results from other studies.