Abstract
We report c-axis resistivity measurements in the mixed state of YBa2Cu4O8 with the magnetic field applied parallel to the a-, b-, and c-axes. For all orientations of the magnetic field, a “kink” is observed in the resistive transition, associated with the first-order melting of an anisotropic three-dimensional vortex lattice. Whereas the melting lines for H∥b and H∥c obey the expected relation H m = H 0(1 − T/T c ) n with n = 1.5, H m (T) for H∥a follows a different temperature dependence with a lower exponent. This result is consistent with a suppression of the melting line due to a reduction in the dimensionality of YBa2Cu4O8 in this field geometry, as observed in normal-state magnetoresistance measurements.
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