A. Orendacova et al., THE ROLE OF HYDROGEN-BONDS IN THE MAGNETIC DIMENSIONALITY OF CUSO4(H2O)(2)(C2H8N2) AND CU(C10H8N2)(2)AG-2(CN)(4)CENTER-DOT-H2O, Journal of magnetism and magnetic materials, 158, 1996, pp. 583-584
The specific heat of CuSO4(H2O)(2)(C2H8N2) (I) and Cu(C10H8N2)(2)Ag-2(
CN)(4) . H2O (II) was measured in the temperature range 75 mK to 8 K.
Observed deviations from the assumed one-dimensional behaviour are cau
sed by hydrogen bonds and dipolar forces. Compound I was classified as
S = 1/2 quadratic AF Heisenberg system with J/k = -1.15 K, and in com
pound II the influence of short-range order is overlapped by dipolar i
nteractions, leading to the onset of long-range order observed at 81 /- 2 mK.