In the cited application note [1] from Quantum Design (QD), the Lake Shore Fast Hall System M91 is used together with an OptiCool from QD. OptiCool is a closed-loop helium optical cryostat with a superconducting magnet designed for low vibration in the sample area. The M91 controls the temperature and magnetic field in the OptiCool. At the same time, the M91 performs resistance, Hall and mobility measurements in Van der Pauw geometry or Hall measurements in 6-cable geometry. In addition, the sample is optically excited. This enables charge carrier-resolved photo-Hall effect measurements.
The application note explains the required hardware and how to control the entire system with MeasureLINK. The software was developed by Lake Shore and controls both the M91 and the OptiCool.

The application note also explains how the samples are attached and wired. The illustration shows an InAs sample as an example. It is mounted on a wired sample holder. A common trick to electrically isolate the sample from the sample holder without significantly impairing the thermal connection is to place a cigarette paper between the sample and the holder.

For more details of the sample measurement and its evaluation, you can check out the application note or contact us.

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