Title :
Anomalous magnetic behaviour in non-resonant microwave absorption study of Bi-2212 superconductors
Author :
Tripathy, Malay Ranjan ; Srivastava, G.P.
Author_Institution :
Dept. of Electron. Sci., Delhi Univ., India
fDate :
9/1/1999 12:00:00 AM
Abstract :
The non-resonant microwave absorption (NRMA) studies in silver doped polycrystalline Bi2Sr2Ca1Cu2 O8 samples have been carried out. The NRMA signal has been observed not only below Tc but also above Tc which is much above the fluctuation regime when the DC magnetic field was swept from -50 G to +50 G through 0G. Anomalous magnetic hysteresis behaviour has been observed where the forward curve lies above the return curve even at lower temperatures. The observed curve has been simulated by taking into consideration the sum of reversible losses as well as irreversible losses using Dulcic and Portis models. This leads to anomalous magnetic hysteresis behaviour as has been observed experimentally
Keywords :
bismuth compounds; calcium compounds; electromagnetic wave absorption; fluctuations in superconductors; high-temperature superconductors; magnetic hysteresis; silver; strontium compounds; Ag doped polycrystalline Bi2Sr2Ca1 Cu2O8 samples; Bi-2212 superconductors; Bi2Sr2Ca1Cu2O8 ; BiSrCaCuO:Ag; DC magnetic field; Dulcic model; HTSC; Portis model; anomalous magnetic behaviour; fluctuation regime; irreversible losses; magnetic hysteresis behaviour; nonresonant microwave absorption; reversible losses; Electromagnetic wave absorption; High temperature superconductors; Magnetic fields; Magnetic hysteresis; Magnetic materials; Silver; Superconducting magnets; Superconducting materials; Superconducting microwave devices; Superconductivity;
Journal_Title :
Magnetics, IEEE Transactions on
