Anomalous magnetic behaviour in non-resonant microwave absorption study of Bi-2212 superconductors

• Published in: IEEE transactions on magnetics Vol. 35; no. 5; pp. 4079 - 4081
• Main Authors: Tripathy, M.R., Srivastava, G.P.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.09.1999; Institute of Electrical and Electronics Engineers
• Subjects: ABSORPTION; BISMUTH OXIDES; CALCIUM OXIDES; COMPUTER SIMULATION; Condensed matter: electronic structure, electrical, magnetic, and optical properties; COPPER OXIDE; COPPER OXIDES; Direct current; DOPED MATERIALS; Electromagnetic wave absorption; ENERGY LOSSES; Exact sciences and technology; Fluctuation; High temperature superconductors; HIGH-TC SUPERCONDUCTORS; HYSTERESIS; MAGNETIC FIELD; Magnetic fields; Magnetic hysteresis; Magnetic materials; Magnetic properties; MATERIALS SCIENCE; MECHANICAL HYSTERESIS; Microwave absorption; MICROWAVE RADIATION; MICROWAVES; PHYSICAL PROPERTIES; Physics; Properties of type I and type II superconductors; Silver; SILVER OXIDES; STRONTIUM OXIDES; Superconducting magnets; Superconducting materials; Superconducting microwave devices; Superconductivity; SUPERCONDUCTORS; Calcium oxides; Strontium oxides; Superconductors; Anomalous magnetic moment; High-Tc superconductors; Bismuth oxides; Anomalous properties; Experimental study; Cuprates; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.800761

The non-resonant microwave absorption (NRMA) studies in silver doped polycrystalline Bi/sub 2/Sr/sub 2/Ca/sub 1/Cu/sub 2/O/sub 8/ 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.