Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session: Correlated Electrons 1

TT 17.33: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

One-dimensional spin chains in NaCuFe₂(VO₄)₃ studied by high-frequency ESR and static magnetization — •Florian Theuss¹, Changhyun Koo¹, Alexander N. Vasiliev², and Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, Heidelberg University, Heidelberg, Germany. — ²Lomonosov Moscow State University, Moscow, Russia

We report magnetization and high-frequency electron spin resonance spectroscopy data (HF-ESR) on the metal oxide NaCuFe₂(VO₄)₃. The magnetically active ions Fe³⁺ and Cu²⁺ in this compound form quasi-one-dimensional spin chains [1]. Magnetization data confirm the evolution of long-range antiferromagnetic order below T_N=9.3± 0.4 K. At high temperatures, the data imply a Curie-Weiss-like behaviour with the Weiss temperature Θ≈ 81.2 K. However, no AFM resonances are observed at low temperatures. Instead, the HF-ESR spectra show a single broad resonance feature without sizeable zero-field splitting. Upon heating, this resonance shifts to a smaller g-factor associated with Fe³⁺-spins. Based on the these data, the AFM ordered phase of the compound will be discussed.
A.V. Koshelev et. al., arXiv:1711.06990v1