Magnetic Field Induced Phase Transitions in YBa2Cu4O8
T. Schneider, J. M. Singer
Abstract
The c-axis resistivity measurements in YBa2Cu4O8 from Hussey et al. for magnetic field orientations along the c-axis as well as within the ab-plane are analyzed and interpreted using the scaling theory for static and dynamic classical critical phenomena. We identify a superconductor to normal conductor transition for both field orientations as well as a normal conductor to insulator transition at a critical field Hc||a with dynamical critical exponent z=1, leading to a multicritical point where superconducting, normal conducting and insulating phases coexist.
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