Abstract
Static and dynamic magnetic properties of P1-phase have been studied by means of muon-spin relaxation (), high-frequency electron-spin resonance (HF-ESR), specific heat, and magnetization studies in magnetic fields up to 25 T. The data imply onset of long-range antiferromagnetic order at = 8 K and a spin-flop-like transition at 0.7–1 T. Below , muon asymmetry exhibits well-defined oscillations indicating a narrow distribution of the local fields. A competing antiferromagnetic phase appearing below = 5.3 K is evidenced by a step in the magnetization and a slight kink of the relaxation rate. Above , both and HF-ESR data suggest short-range spin order. HF-ESR data show that local magnetic fields persist up to at least K. Analysis of the antiferromagnetic resonance modes and the thermodynamic spin-flop field suggest zero-field splitting of GHz which implies small but finite magnetic anisotropy.
2 More- Received 14 March 2018
- Revised 30 April 2018
DOI:https://doi.org/10.1103/PhysRevB.97.224416
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