$S$ =1/2 ferromagnetic Heisenberg chain in a verdazyl-based complex

Abstract

We present a model compound for the $S$=1/2 ferromagnetic Heisenberg chain composed of the verdazyl-based complex $[$Zn(hfac)${}_2]$$[$4-Cl-$o$-Py-V-(4-F)${}_2]$. $Ab$ $initio$ MO calculations indicate a predominant ferromagnetic interaction forming an $S$=1/2 ferromagnetic chain. The magnetic susceptibility and specific heat indicate a phase transition to an AF order owing to the finite interchain couplings. We explain the magnetic susceptibility and magnetization curve above the phase transition temperature based on the $S$=1/2 ferromagnetic Heisenberg chain. The magnetization curve in the ordered phase is described by a conventional AF two-sublattice model. Furthermore, the obtained magnetic specific heat reproduces the almost temperature-independent behavior of the $S$=1/2 ferromagnetic Heisenberg chain. In the low-temperature region, the magnetic specific heat exhibits $\sqrt{T}$ dependence, which is attributed to the energy dispersion in the ferromagnetic chain.

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Cited by in corpus (3)

• Observation of thermodynamics originating from a mixed-spin ferromagnetic chain
• Gapped ground state in a spin-1/2 frustrated square lattice
• Quantum spin state stabilized by coupling with classical spins