Abstract
The Josephson-vortex flow resistance oscillates as a function of magnetic field when a triangular vortex lattice is formed. In order to study the lower boundary field of the triangular-lattice phase of Josephson vortex, the vortex-flow resistance as a function of magnetic field parallel to the ab-plane was measured over a wide range of temperatures on a Bi 2Sr 2CaCu 2O 8+ y (Bi-2212) single crystal whose oxygen content was controlled by annealing in vacuum. We have found that the starting field H start of the oscillations, which corresponds to the boundary field of the triangular-lattice phase, decreases systematically with increasing anisotropy parameter ( γ) of Bi-2212 at all measured temperatures. This behavior is consistent with various theoretical expectations that the boundary field is inversely proportional to γ.
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