For CuGeO 3 single crystals doped with 1% of Fe, the quantum critical behavior in a wide temperature range 1-40 K is reported. The critical exponents for susceptibility along different crystallographic axes are determined: α = 0.34 (B ∥ a and B ∥ c) and α = 0.31 (B ∥ b). The description of the temperature dependencies of the line width and g-factor could be obtained in the Oshikawa-Affleck theory assuming that staggered component of the magnetic moment is located predominantly along b-axis. Possible arguments favoring the competition between effects of the staggered field and antiferromagnetic ordering are provided.
- Quantum critical phenomena
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics