TY - JOUR
T1 - Vortex-antivortex behavior in a tilted YBa2Cu3O7-δ crystal
AU - Obaidat, I. M.
AU - Safar, H.
AU - Kouvel, J. S.
N1 - Funding Information:
We are grateful to L.N. Bulaevskii for helpful discussions, to Lisa Paulius for the carefully prepared YBCO crystal sample of this study, and to the National Science Foundation (DMR) for partial support of this work.
PY - 1999/4/20
Y1 - 1999/4/20
N2 - Previous magnetization-vector measurements on a YBa2Cu3O7-δ crystal, tilted by angles (θ) of up to 90° relative to the fixed field applied initially along the c axis during cooling to 4.2 K, have revealed that the original trapped vortices along c develop sizeable branches in the ab planes. These measurements have now been extended on the same crystal to tilt angles of up to 180°, and it is found that Bab, the flux density component along ab, reverses in sign and reaches a large negative maximum near θ = 135°, despite the positive orientation of the internal field along ab. This anomalous behavior of Bab is attributed to the entry of antivortices that form branches antiparallel to the original vortex branches along ab as a consequence of strongly attractive antivortex-vortex interactions. The varying coexistence of antivortex and vortex branches is seen to be reversible as θ is cycled between 90° and 180°.
AB - Previous magnetization-vector measurements on a YBa2Cu3O7-δ crystal, tilted by angles (θ) of up to 90° relative to the fixed field applied initially along the c axis during cooling to 4.2 K, have revealed that the original trapped vortices along c develop sizeable branches in the ab planes. These measurements have now been extended on the same crystal to tilt angles of up to 180°, and it is found that Bab, the flux density component along ab, reverses in sign and reaches a large negative maximum near θ = 135°, despite the positive orientation of the internal field along ab. This anomalous behavior of Bab is attributed to the entry of antivortices that form branches antiparallel to the original vortex branches along ab as a consequence of strongly attractive antivortex-vortex interactions. The varying coexistence of antivortex and vortex branches is seen to be reversible as θ is cycled between 90° and 180°.
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U2 - 10.1016/S0921-4534(99)00204-X
DO - 10.1016/S0921-4534(99)00204-X
M3 - Article
AN - SCOPUS:0032672595
SN - 0921-4534
VL - 315
SP - 180
EP - 184
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 3
ER -