Phys. Rev. B 19, 420–431 (1979)Theoretical and experimental study of the magnetic properties of the singlet-ground-state system Cu(NO3)2·2.5H2O: An alternating linear Heisenberg antiferromagnetReceived 13 February 1978; published in the issue dated 1 January 1979 The thermodynamic properties of Cu(NO3)2·2.5H2O are compared with calculated properties of the one-dimensional alternating Heisenberg antiferromagnet as described by the Hamiltonian: H=-2JΣn(S⃗2n·S⃗2n+1+αS⃗2n·S⃗2n-1)-gμBΣnH⃗·S⃗n, with α=0.27 and J/k=-2.6 K. The thermodynamic properties, obtained from exact calculations of the eigenvalues of H, for 2, 4, 6, 8, 10, and 12 spins, have been extrapolated to n=∞ to obtain the behavior of the infinitely long alternating chain. © 1979 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.19.420
DOI:
10.1103/PhysRevB.19.420
PACS:
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