Non-resonant microwave absorption studies in Bi1.6Pb0.4Sr2Ca2Cu3O10+x

Non-resonant microwave absorption (NRMA) studies have been carried out on B i1.6Pb0.4Sr2Ca2Cu3O10+x pellets sintered for different durations varying fr om 24 to 168 h by using EPR technique. A detailed study of the temperature dependence of the NRMA signal amplitude, peak-to-peak width, hysteresis are a has been carried out. Apart from showing a flux line lattice (FLL) meltin g temperature T-m(B) (60-70 K), it is interesting to note that hysteresis l oops showed the anomalous magnetic behaviour in the entire temperature regi ons even far below the fluctuation regime, The results are discussed in ter ms of several current models for the NRMA effects as well as for its anomal ous magnetic hysteresis behaviour. (C) 1999 Published by Elsevier Science B .V. All rights reserved.