Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.98: Poster

Wednesday, March 14, 2018, 15:00–19:00, Poster B

Magnetic properties of the spin-1 chain compound NiCl₃C₆H₅CH₂CH₂NH₃ — Ferdinand Lipps¹, Anke Arkenbout², Alexey Polyakov², Marco Günter³, Timur Salikhov⁴, Eugeniia Vavilova⁴, Hans-Henning Klauss³, Bernd Büchner¹, Thomas Palstra², and •Vladislav Kataev¹ — ¹IFW Dresden, 01069 Dresden, Germany — ²University of Groningen, 9747 AG Groningen, The Netherlands — ³TU Dresden, 01069 Dresden, Germany — ⁴Zavoisky Physical Technical Institute, 420029 Kazan, Russia

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 isotropic and 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 T_N ≈ 10 K presumably due to small interchain couplings. Interestingly, frequency-, magnetic field-, and temperature-dependent ESR measurements, as well as the NMR data, reveal an inhomogeneous ground state of co-existent mesoscopically spatially separated AFM ordered and spin-singlet state regions.