On the two-dimensional, spin- Heisenberg ferromagnetic models

Calorimetric investigation of phase transitions in the layered antiferromagnetic molecule-based material {N(n-C5H11)4[MnIIFeIII(ox)3]}∞(ox=oxalato)

“…However, in the present case, the magnetic contribution to excess enthalpy and entropy were evaluated by adding the following three components: (i) integration of the extrapolated C mag values to 0 K with respect to T and ln T, respectively from 0-2 K with the help of spin wave theory (mentioned in Section. 3.4.2. in detail), (ii) the excess enthalpy and entropy derived from the observed heat capacity data from 2-50 K, and (iii) integration of the extrapolated C mag with respect to T and ln T; respectively, up to infinite temperature by using the high-temperature series expansion of S ¼ 5=2 for two-dimensional Heisenberg antiferromagnetic honeycomb lattice [23]. The magnetic contribution to enthalpy and entropy gain thus determined are 1.11 kJ mol À1 and 33.22 J K À1 mol À1 , respectively.…”

Linkage isomers of dibromobis(1-(2-methoxyethyl)tetrazole)copper(ii) containing either a bromide or a unique tetrazole bridge

“…The results of Baker et al 23 for the two-dimensional Heisenberg model have been used to fit the data. The series take the following form:…”

Magnetically linear and quadratic hexanitrocuprates

“…3, the experimental results are compared with theoretical results for the S = 1/2 simple quadratic (SQ) AF Heisenberg lattice for .1 /k = -1.0 K. The high T theory was obtained from Pade approximants to the series expansion given by Baker et al [18]. 3, the experimental results are compared with theoretical results for the S = 1/2 simple quadratic (SQ) AF Heisenberg lattice for .1 /k = -1.0 K. The high T theory was obtained from Pade approximants to the series expansion given by Baker et al [18].…”