Quantum Critiality and Collective Effects in Low Dimensional Magnet CuGeO3 Probed by High Frequency EPR
Demishev, S. V · Semeno, A. V. · Pronin, A. A. · Sluchanko, N. E. · Samarin, N. A. · Ohta, H. · Okubo, S. · Kimata, M. · Koyama, K. · Motokawa, M. · Kuznetsov, A. V.
Original · EN
For the CuGeO3 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: a=0.34 (B //a and B //c) and a=0.31 (B //b). The description of the temperature dependences of the line width and g-factor could be obtained in the OA 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.
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