3D-xy critical properties of YBa2Cu4O8 and magnetic field induced 3D to 1D crossover

Details 3D-xy critical properties of YBa2Cu4O8 and magnetic field induced 3D to 1D crossover 3D-xy critical properties of YBa2Cu4O8 and magnetic field induced 3D to 1D crossover

2008-03-10

arxiv.org/abs/0803.1384v2

J. Phys.: Condens. Matter 20, 345210 (2008)

Physics

Condensed Matter

Superconductivity

8 pages, 4 figures

Scientific paper

10.1088/0953-8984/20/34/345210

We present reversible magnetization data of a YBa2Cu4O8 single crystal and analyze the evidence for 3D-xy critical behavior and a magnetic field induced 3D to 1D crossover. Remarkable consistency with these phenomena is observed in agreement with a magnetic field induced finite size effect, whereupon the correlation length transverse to the applied magnetic field cannot grow beyond the limiting magnetic length scale L_H. By applying the appropriate scaling form we obtain the zero-field critical temperature, the 3D to 1D crossover, the vortex melting line and the universal ratios of the related scaling variables. Accordingly there is no continuous phase transition in the (H,T)-plane along the H_c2-lines as predicted by the mean-field treatment.

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