Universidad Autonoma de Madrid, Low Temperature and High Magnetic Field Laboratory
This laboratory belongs to the Universidad Autonoma in Madrid and hosts several high-magnetic-field systems, mostly dedicated to Scanning Tunneling Microscopy (STM). The lab houses several superconducting magnets up to 22 T in a variety of configurations. Magnets have either 50 or 80 mm bore diameter and are mostly equipped with dilution-refrigerator inserts, in which the available sample space is of approximately 44 or 70mm diameter. There is one magnet reaching 22 T and two magnets reaching 17 T. Other more usual magnets are run by the staff of the laboratory, including a vector magnet (5-1-1 T), one 13 T magnet, and two 10 T magnets.
The research carried out by the laboratory is focused on investigating surfaces of quantum materials using STM. The in-house-built electronic STM control allows measurements of the I-V characteristics with <8 μeV resolution in voltage and a wide range of accessible currents at temperatures well below 100 mK. With this equipment, the laboratory offers the possibility to conduct density of states measurements with an extremely high resolution in energy, covering studies in superconductors, semimetals, and magnets presenting phenomena characterized by small electronic energies. These include research on pnictides and high-temperature superconductors, heavy-fermion physics, topological surface states, magnetism, and Landau-quantization studies. The surfaces are conditioned by in-situ cleaving at cryogenic vacuum, and there is experience in measuring some ex-situ surfaces evaporated using standard methods.
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