Noise power spectrum of the Bi2Sr2CaCu2Ox single crystal in the low magnetic fields

We present the comprehensive description of the magnetic flux noise of the Bi2Sr2CaCu2Ox high-Tc superconductor. The effect of the dissipation of flux motions on the noise power spectrum was investigated below the transition temperature. The noise power is proportional to the magnetic field in the flux creep region. The exponent of the spectrum deceases for increasing magnetic field. And it has a corner frequency which becomes lower when stronger the fields. These are related to the self-organized critical(SOC) properties of the flux creep noise.