High Magnetic Fields Laboratory

This laboratory comprises a 4He cryostat with a 10 Tesla magnet and a 4He/3He (0.3-300 K) Oxford Cryostat equipped with a 18 Tesla magnet, both dedicated to electrical transport measurements, such resistivity, magnetoresistance, thermoelectric power and Hall Effect. Two different inserts can be used allowing either a temperature range from 1.6 K up to 300 K (4He flow) or from 0.3 K up to 300 K (3He cryostat). Home-made probes are used for magnetotransport measurements in quasi-1D or 2D materials, intermetallic compounds and High Tc superconductors. A very precise rotating sample holder was built at CTN to measure the variation of the magnetoresistance as a function of the angle with a resolution better than 0.01º between the magnetic field and the crystallographic axis or the electrical current.

The 3He insert is equipped with a rotating sample holder (0.02º precision, manually operated) for resistivity, magnetoresistivity and Hall Effect. This system was used to study localization effects, Shubnikov-de Haas oscillations and magnetoresistance in quasi-2D materials.

This equipment is available to the scientific community, on the basis of research cooperation and co-authorship of publications in international scientific journals and presentations in Conferences.

Contact person: Elsa B. Lopes – eblopes@ctn.tecnico.ulisboa.pt

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