Relaxation Time of Spin System in K2CuF4 near Tc Determined by Magnetic Susceptibility Measurement in High Frequency Magnetic Field

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Abstract
The magnetic susceptibilities of K 2 CuF 4 in a high frequency magnetic field were measured in the frequency range from 3 MHz to 64 MHz and in the temperature range from 5.5 K to 7.5 K using a Schering bridge. The relaxation time of spin system in K 2 CuF 4 near T c in the paramagnetic region was estimated from the frequency dependence of the real and the imaginary parts of the high frequency magnetic susceptibility. It is inferred from our results that the relaxation mechanism of spin system in K 2 CuF 4 in the paramagnetic region is monodispersive. The relaxation time increases extremely, when temperature approaches T c . The relaxation time very near T c is about 3×10 -9 sec.