Vortex melting and decoupling transitions in YBa${}_2$Cu${}_4$O${}_8$ single crystals

X. G. Qiu, V. V. Moshchalkov, J. Karpinski

The vortex correlation along the c-axis in high quality single crystals of YBa${}_2$Cu${}_4$O${}_8$ has been investigated as a function of temperature T in different magnetic field…