Abstract
(Nd,Eu,Gd)Ba2Cu3Ox (NEG123) bulk shows high irreversibility fields over 14 T at 77.3 K. In order to study the originof the high irreversibility field, transport measurements for NEG123 bulk were performed asfunctions of temperature, high magnetic fields (up to 27 T) and field angle. We found thatc-axis correlated disorder exists for samples with 3 and 40 mol% NEG211, although theirirreversibility fields are different. The enhancements of the irreversibility fields at 77.3 K due to thec-axis correlated disorder are almost the same (about 1 T) for both samples andare in agreement with that of Y123 bulk with a twin boundary. The partiallyentangled vortex liquid and the Bose glass phases, which are induced by thec-axis correlated disorder, play an important role in the improvement of the irreversibility field.However, in order to explain the much higher irreversibility field, we should take account not only ofthe c-axis correlated disorder but also of the other pinning centres such as the nanolamella.
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