Magnetic properties of the Haldane-gap material NENB

Abstract

Results of magnetization and high-field ESR studies of the new spin-1 Haldane-chain material [Ni(C2H8N2)2NO2](BF4) (NENB) are reported. A definite signature of the Haldane state in NENB was obtained. From the analysis of the frequency-field dependence of magnetic excitations in NENB, the spin-Hamiltonian parameters were calculated, yielding Delta = 17.4 K, g_parallel = 2.14, D = 7.5 K, and |E| = 0.7 K for the Haldane gap, g factor and the crystal-field anisotropy constants, respectively. The presence of fractional S = 1/2 chain-end states, revealed by ESR and magnetization measurements, is found to be responsible for spin-glass freezing effects. In addition, extra states in the excitation spectrum of NENB have been observed in the vicinity of the Haldane gap, which origin is discussed.

5 pages, 6 figures

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• Large-Scale Numerical Evidence for Bose Condensation in the S=1 Antiferromagnetic Chain in a Strong Field
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• Significant Inverse Magnetocaloric Effect induced by Quantum Criticality
• Macroscopic quantum state in a semiconductor device
• Nickel-Titanium double perovskite: A three-dimensional spin-1 Heisenberg antiferromagnet
• Electronic structure and magnetic properties of the strong-rung spin-1 ladder compound Rb${}_3$Ni${}_2$(NO${}_3$)${}_7$
• Dynamic crystallization in a quantum Ising chain
• Promising regimes for the observation of topological degeneracy in spin chains
• Dynamically generated quadrupole polarization using Floquet adiabatic evolution