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Low density flux dynamics in Nd based cuprate (NdBa2Cu3O7-x) HTSC singlecrystals trapped in 1 Oe range DC magnetic fields were investigated for thefirst time. Complex measurements of time, temperature and field dependence ofmagnetization were performed. Using the results obtained and the Anderson-Kimmodel the normalized magnetization relaxation rate S and the averaged effectivepinning potential U were calculated. We show a significant (one or even twoorders) increase in the effective pinning potential in these samples incomparison with measurements performed in high magnetic fields for similarcuprate single crystals formerly. In a wide enough range of temperatures closeto Tc (0.72 < T/Tc < 0.93) it has been shown that the doping of NdBa2Cu3O7-xsingle crystals with calcium atoms leads to the increase of the averagedeffective pinning potential with an insignificant decreasing of the criticaltemperature.

Enhanced pinning in high-temperature superconducting cuprate single crystals at low DC magnetic field