Thermodynamic properties of ferromagnetic mixed-spin chain systems

Details Thermodynamic properties of ferromagnetic mixed-spin chain systems Thermodynamic properties of ferromagnetic mixed-spin chain systems

2003-07-31

arxiv.org/abs/cond-mat/0307761v2

Phys. Rev. B69, 174430 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages including 7 figures, submitted to Phys. Rev. B; series extended to 29th. QMC added

Scientific paper

10.1103/PhysRevB.69.174430

Using a combination of high-temperature series expansion, exact diagonalization and quantum Monte Carlo, we perform a complementary analysis of the thermodynamic properties of quasi-one-dimensional mixed-spin systems with alternating magnetic moments. In addition to explicit series expansions for small spin quantum numbers, we present an expansion that allows a direct evaluation of the series coefficients as a function of spin quantum numbers. Due to the presence of excitations of both acoustic and optical nature, the specific heat of a mixed-spin chain displays a double-peak-like structure, which is more pronounced for ferromagnetic than for antiferromagnetic intra-chain exchange. We link these results to an analytically solvable half-classical limit. Finally, we extend our series expansion to incorporate the single-ion anisotropies relevant for the molecular mixed-spin ferromagnetic chain material MnNi(NO$_{2}$)$_{4}$(ethylenediamine)$_{2}$, with alternating spins of magnitude 5/2 and 1. Including a weak inter-chain coupling, we show that the observed susceptibility allows for an excellent fit, and the extraction of microscopic exchange parameters.

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