Characterization of the spin-1/2 linear-chain ferromagnet CuAs<sub>2</sub>O<sub>4</sub>
- Author(s)
- Kevin Caslin, Reinhard Karl Kremer, Fereidoon S. Razavi, Armin Schulz, Alfonso Munoz, Franz Pertlik, Jihe Liu, Mike H. Whangbo, Joseph Law
- Abstract
The magnetic and lattice properties of the S=1/2 quantum-spin-chain ferromagnet CuAs2O4, mineral name trippkeite, were investigated. The crystal structure of CuAs2O4 is characterized by the presence of corrugated CuO2 ribbon chains. Measurements of the magnetic susceptibility, heat capacity, electron paramagnetic resonance, and Raman spectroscopy were performed. Our experiments conclusively show that a ferromagnetic transition occurs at ∼7.4 K. Ab initio DFT calculations reveal dominant ferromagnetic nearest-neighbor and weaker antiferromagnetic next-nearest-neighbor spin exchange interactions along the ribbon chains. The ratio of Jnn/Jnnn is near −4, placing CuAs2O4 in close proximity to a quantum critical point in the Jnn-Jnnn phase diagram. TMRG simulations used to analyze the magnetic susceptibility confirm this ratio. Single-crystal magnetization measurements indicate that a magnetic anisotropy forces the Cu2+ spins to lie in an easy plane perpendicular to the c axis. An analysis of the field- and temperature-dependent magnetization by modified Arrott plots reveals a 3d-XY critical behavior. Lattice perturbations induced by quasihydrostatic pressure and temperature were mapped via magnetization and Raman spectroscopy.
- Organisation(s)
- Department of Mineralogy and Crystallography
- External organisation(s)
- Brock University, University of La Laguna, Max-Planck-Institut für Festkörperforschung, North Carolina State University, Helmholtz-Zentrum Dresden-Rossendorf
- Journal
- Physical Review B
- Volume
- 89
- No. of pages
- 11
- ISSN
- 1098-0121
- DOI
- https://doi.org/10.1103/PhysRevB.89.014412
- Publication date
- 01-2014
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 104003 Inorganic chemistry, 105113 Crystallography, 104006 Solid state chemistry
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/e327ff94-0194-47dc-86c3-91babd84bfd6