Magnetic properties of the spin-1 chain compound NiCl3C6H5CH2CH2NH3
F. Lipps1, A.H. Arkenbout2, A. Polyakov2, M. Günther3, T. Salikhov4, E. Vavilova4, H.-H. Klauss3, B. Büchner1,3, T.M. Palstra2, and V. Kataev1
1Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany
2Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
3Institut für Festkörperphysik, TU Dresden, D-01069 Dresden, Germany
Received June 1, 2017
We report experimental results of the static magnetization, ESR and NMR spectroscopic measurements of the Ni-hybrid compound NiCl3C6H5CH2CH2NH3. In this material NiCl3 octahedra are structurally arranged in chains along the crystallographic a axis. According to the static susceptibility and ESR data Ni2+ spins S = 1 are isotropicand are coupled antiferromagnetically (AFM) along the chain with the exchange constant J = 25.5 K. These are important prerequisites for the realization of the so-called Haldane spin-1 chain with the spin-singlet ground state and a quantum spin gap. However, experimental results evidence AFM order at TN ≈ 10 K presumably due to small interchain couplings. Interestingly, frequency-, magnetic field-, and temperature-dependent ESR measurements, as well as the NMR data, reveal signatures which could presumably indicate an inhomogeneous ground state of coexistent mesoscopically spatially separated AFM ordered and spin-singlet state regions similar to the situation observed before in some spin-diluted Haldane magnets.
PACS: 76.30.–v Electron paramagnetic resonance and relaxation;
Key words: ESR, NMR, spin chains.
Published online: September 25, 2017