Abstract
The magnetic field dependence of the resistance in single crystal Bi 2Sr 2CaCu 2O 8+δ was measured near the ab-plane. The sharp drop of the resistance attributed to the first-order melting transition is clearly detected up to the angle θ = 89.86°. However, above this angle the height of the resistivity drop suddenly begins to decrease while the sharpness remains almost unchanged. Afterwards, the kink disappears and quite smooth field dependence of resistivity is observed. This unusual behavior may be connected with the change from first order to second order solid-smectic phase transition. This behavior can also be argued with the lock-in transition at θ = 89.86°.
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