First Order-Like Out-of-Plane Resistive Transition in YBa2Cu3O7−δ for B Exactly Parallel to ab-Planes
Tóm tắt
Melting transition of a flux line lattice//
ab
-planes has been studied in twinned YBa
2
Cu
3
O
7−δ
single crystals using transport measurements along the
c
-axis. In contrast to previously studied geometry with field and current in planes (W.K. Kwok et al., Phys. Rev. Lett.
72
, 1088 (1994)), a step-like
c
-axis resistive transition has been found for exact field alignment along
ab
-planes. The angular dependence of ρ
c
with rotation of the crystal around the
c
-axis was studied. The results show that below the resistive step, the pinning force is anomalously increased when the field is aligned along
ac
(
bc
)-crystal facets.
Tài liệu tham khảo
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