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We report a study of magnetic susceptibility and electrical resistivity as afunction of temperature and magnetic field in superconducting crystals ofLa$_{2-x}$Ca$_{1+x}$Cu$_{2}$O$_{6}$ with $x=0.10$ and 0.15 and transitiontemperature $T_{c}^{\rm m} = 54$ K (determined from the susceptibility). Whenan external magnetic field is applied perpendicular to the CuO$_2$ bilayers,the resistive superconducting transition measured with currents flowingperpendicular to the bilayers is substantially lower than that found withcurrents flowing parallel to the bilayers. Intriguingly, this anisotropicbehavior is quite similar to that observed for the magnetic irreversibilitypoints with the field applied either perpendicular or parallel to the bilayers.We discuss the results in the context of other studies that have found evidencefor the decoupling of superconducting layers induced by a perpendicularmagnetic field.

Evidence for magnetic-field-induced decoupling of superconducting bilayers in La$_{2-x}$Ca$_{1+x}$Cu$_{2}$O$_{6}$