Quantum criticality and collective effects in low-dimensional magnet CuGeO 3:Fe probed by high frequency EPR

S. V. Demishev, A. V. Semeno, A. A. Pronin, N. E. Sluchanko, N. A. Samarin, H. Ohta, S. Okubo, M. Kimata, K. Koyama, M. Motokawa, A. V. Kuznetsov

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)105-108
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume20
Issue number2 SPECIAL ISSUE
DOIs
Publication statusPublished - 2007 Feb

Keywords

  • CuGeO
  • EPR
  • Quantum critical phenomena

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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