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|Type:||Artigo de periódico|
|Title:||Anisotropy In Bi2212 Single Crystals Studied By Non-resonant Microwave Absorption: Hysteresis And Line Shapes|
Ricardo Da Silva R.
|Abstract:||Microwave absorption in a high quality Bi2212 single crystal is studied at 77 K, using non-resonant microwave absorption (NMA) technique. NMA line shape and low field hysteresis are highly anisotropic. Two peaks, a narrow P1-peak followed by a broad P2-peak are observed for applied field perpendicular to the ab-plane. For the applied field parallel to the ab-plane, the broad P2-peak disappears. For an intermediate orientation of the field, say ∼55°, to the ab-plane, the P1-like peak broadens considerably with a possible mixing of both P1-peak and P2-peak. While there is a pronounced hysteresis in the P1-peak just near zero field for applied field parallel to the ab-plane (Cu-O plane), this hysteresis in P1-peak is nearly absent when the field is applied perpendicular to the ab-plane. In both these orientations, hysteresis is absent in NMA signals beyond the P1-peak till very high fields. At the inte rmediate orientation angle of ∼55° to the ab-plane, the reverse sweep NMA signal collapses into the zero-base line. This is a remarkable hysteresis effect. This may be due to the interaction between Josephson vortices and Abrikosov vortices which can happen in tilted magnetic fields. © 2001 Elsevier Science B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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