Abstract
We present the time dependence of the diamagnetic magnetization for a polycrystalline sample of LuNi 2B 2C measured after zero-field cooling (ZFC) in magnetic fields 5 kOe, 6 kOe and 7 kOe between 2 K and 13 K with a commercial superconducting quantum interference device (SQUID) magnetometer. Analysis using the short-time data reveals that there are two peaks in the normalized logarithmic decay of the magnetization A as a function of temperature for the three measuring fields investigated. The positions of the two peaks shift towards the lower temperature regime with the increasing applied field. The occurrence of the second unusual peak in A could be a possible reflection of the presence of two pinning mechanisms. Analysis of Arrhenius plots gives two average pinning energies for each measuring field.
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