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Imaging in the Bluefors dilution refrigerator!

We are obtaining first images from a calibration sample using a home-built and brand new microscope inside our Bluefors dilution refrigerator! The left image is a DC magnetic image. The calibration sample has a meander made from Niobium. The lines are visible due to the Meissner effect screening the background magnetic field. A few vortices are visible as well. We flow an ac current through the meander at the same time. The right image is taken with a lock-in amplifier and shows the magnetic flux due to the current. Image is taken at 50mK. Stay tuned for even cooler images :)

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