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TT: Fachverband Tiefe Temperaturen
TT 59: Poster Session: Topology
TT 59.20: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG4
Experimental studies of phase diagram of compound Ni(2aepy)2Cl(H2O)]Cl·H2O - a spin-1 antiferromagnetic chain — •Mariia Holub1, Slavomíra Šterbinská2, Marc Uhlarz3, Juraj Černák2, and Erik Čižmár1 — 1Institute of Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, Košice, Slovakia — 2Institute of Chemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, Košice, Slovakia — 3Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße, Dresden, Germany
We present the study of compound Ni(2aepy)2Cl(H2O)]Cl·H2O (2aepy = 2-aminoethylpyridine) identified as a spin-1 antiferromagnetic chain with ratio of D/J=1.14 (D is the single-ion anisotropy, J is the intrachain exchange interaction). It represents a unique experimental example of a system close to the quantum critical point (QCP), which is a topological phase transition that separates Haldane and Large-D gapped phases for spin-1 chains. In this work, we observed the presence of field-induced crossover into the gapless Tomonaga-Luttinger liquid phase using low-temperature specific heat measurements. A very low first critical field is in good agreement with the small energy gap predicted close to QCP. Estimation of saturation field (second critical field) using D and J parameters was confirmed by high-field magnetic measurements at ≈12.5 T.
This work was supported by APVV-18-0016, APVV-18-0197, and HLD-HZDR, member of the European Magnetic Field Laboratory (EMFL).