1993 年 62 巻 9 号 p. 3011-3014
Submillimeter wave ESR has been performed from 90 to 380 GHz for CsCuCl3 using the pulsed magnetic fields up to 15 T in the temperature range from 1.8 to 86 K. In the ordered phase below TN=10.5 K, shift of the ESR mode from that in the conventional mean field theory including Dzyaloshinsky-Moriya interaction has been observed for H⁄⁄c above the critical field Hc where a small jump in the magnetization occurs. These anomalies cannot be understood in terms of the mean field theory and will be discussed in connection with a new theory proposed by Shiba and Nikuni which suggests that the quantum effect is responsible for the anomalies at Hc.
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