Magnetic Studies of End-Chain Spin Effects in the Haldane Gap Material Ni(C3H10N2)2N3(ClO4)
G.E. Granroth, B.H. Ward, L.-K. Chou, G.E. Fanucci, S. Maegawa, N.S., Bell, J.H. Adair, J. Krzystek, L.-C. Brunel, D.R. Talham, and M.W. Meisel
TL;DR
This study uses ESR and magnetization measurements to investigate end-chain spin effects in the Haldane gap material Ni(C3H10N2)2N3(ClO4), confirming S=1/2 end-chain spins and their interactions.
Contribution
It provides new experimental evidence that end-chain spins in NINAZ are S=1/2 and details their interactions within the Haldane phase.
Findings
End-chain spins are confirmed to be S=1/2.
Spectral weight indicates interactions between end-chain spins and magnetic excitations.
No evidence found for S=1 end-chain spins.
Abstract
Electron spin resonance (ESR), at 9, 94, and 190 GHz, and magnetization studies on polycrystalline, powder, and ultrafine powder samples of Ni(C3H10N2)2N3(ClO4) (NINAZ) have revealed several effects arising from the Haldane phase. Using the g value of the end-chain spin as determined by ESR, our results confirm that the end-chain spins are S=1/2 and show no evidence for S=1 end-chains. In addition, the ESR signals reveal spectral weight consistent with a model describing interactions between the end-chain spins on the shortest chains and between the magnetic excitations on the chains and the end-chain spins.
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