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Magnetotransport

By means of magnetotransport measurements spin and quantum phenomena in semiconductor nanostructures can be investigated. Depending on the required measurement temperature different types of cryostats are used. In order to obtain high magnetic fields, often superconducting magnets are employed.

For extremely low temperatures an Oxford Kelvinox 200 He-3/He-4 dilution refrigerator and a Leiden Cryogenics dilution refrigerator are available. Both with a base temperature of about 10 mK. In a dilution fridge a mixture of He-3 and He-4 is used for cooling. At low temperatures a phase separation into a He-3 rich and He-3 diluted phase occurs. The cooling power results from the transfer of He-3 from the He-3 rich into the He-3 diluted phase. This cryostats is equipped with a superconduction magnets, in case of the Oxford system with a vector magnet.

Leiden dilution fridgeLeiden Cryogenics dilution refrigerator, control panel


For measurements down to 300 mK an Oxford He-3 cryostat is available, which is equipped with a 8 T magnet. For cooling down to base temperature previously condensed He-3 is pumped by a sorption pump.

He-3 CryostatOxford He-3 cryostat


In addition to the systems mentioned above it is also possible to measure samples in a He-4 continuous flow cryostat at temperatures from 4 K up to room temperature. Here, a magnetic field of 0.5 T can be applied.


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