side of the sample holder (fig. 2 D). No further preparation is installed at present. However, sample space in the vacuum chamber allows for the installation of an in-situ cleavage station. The electrical wiring for the piezo scan head, the thermometers and the heater is done via a 36-pin IC socket. The leads from the plug to the mixing chamber (including the copper- powder filters, see below) are made of polyimid-isolated 100 − µ m Cu wire. For the connection to the room temperature part of the cryostat manganin wires are used for the piezo leads to minimize the thermal conductance and to avoid a modification of the signal form due to large resistance changes. The thermometer leads from the mixing chamber to the 1 K pot are made of superconducting NbTi wires. The feedthroughs for current and voltage are made of gold-plated copper-shielded coaxial cable with stranded copper center wire (LakeShore CC-SC-100), which is connected via SMA plugs to the copper-powder filter placed at the mixing chamber. The connection to the upper part of the cryostat is done with stainless steel coaxial cables (LakeShore CC-SS- 100). The measurement of the capacitance between tip and sample is used to monitor and control the tip-sample distance during cooling the cryostat and at low temperatures. The maximum 7 FIG. 4: Sketch of the cross-section slider (parts B,C,D) mounted on the sapphire rods (A). The V/W shape leads to three lines at which the slider is touching each rod. A displacement of the sapphire rods due to horizontal forces is avoided by the V/W shape of the slider.