The ability to modify the stacking sequence of ultrathin films offers a unique way to change either the interaction strength or the doping, but demands a careful control of each atomic monolayer. Progress is hampered by the lack of a direct method that allows differentiation on a local scale between the various terminating layers of a crystal. Here, the combination of a vacuum annealing process and friction force microscopy reveals this local distinction on a SrTiO3 surface. Using the friction contrast, we find how the terminating layer of a single crystal profoundly influences the terrace edge structure.
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Recently, the normal state resistivity of high temperature superconductors (in particular in La2-xSrxCuO4 single crystals) has been studied extensively in the region below Tc by suppressing the superconducting state in high magnetic fields [1] . In the present work we report on the normal state resistance of underdoped La2-xSrxCuO4 thin films under epitaxial strain [2] , measured far below Tc by applying pulsed fields up to 60 T [3] . We will compare the transport measurements on these high temperature superconductors with transport data reported for the Sr2.5Ca11.5Cu24O41 spin ladder compound [4] . This comparison leads to an interpretation of the data in terms of the recently proposed 1D quantum transport model and the charge-stripe models [5,6]
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