shapes and sizes

Lamellas can be patterned in complicated shapes and sizes. However sometimes, to understand what’s going on, it’s best to stick to the basics and study simple shapes like a square or a circle. This sample will be cooled down until it becomes superconducting and then will be investigated using scanning SQUID microscopy.

Under pressure

Performing electrical transport measurements under pressure adds an additional level of difficulty to the experiment. This lamella of LaRhIn5 has been welded onto a sapphire substrate with FIB deposited platinum strips to make it more durable and withstand higher pressures.

CeIrIn5

Annealing microstructures at 350°C. What can go wrong? This structure  was meant for a prototypical device capable of electric field induced motion.
Exposure to high T induced a strong deformation and growth of binary In-Au crystallites at the interface between the device and the Gold electrodes.

In-plane anisotropy

Measuring anisotropic transport that has a non-trivial angle dependence can be challenging. The FIB is the perfect tool to structure current paths along well defined directions in the crystal. In this device we probe the resistivity at 0, 10, 20 and 30 degrees.

Transverse electron focusing

In the ultra-pure metal PdCoO2 the mean free path of electrons is over 20 microns long at low temperatures. In this regime the transport properties are dominated by the ballistic motion of the electrons. Here a single crystal has been patterned into a device where transverse electron focusing can be measured.