engleski

Quantum magnetotransport and de Haas{;;;van Alphen measurements in the three-dimensional Dirac semimetal Pb0.83Sn0.17Se

Magnetoresistance (MR), Hall resistance and magnetization of the Pb0.83Sn0.17Se crystals have been measured in magnetic eld up to 15 T and 5 T, respectively, and temperatures from 1.7 K up to 300 K. A large linear and temperature dependent MR is observed in magnetic eld up to 15 T. The de Haas{; ; ; van Alphen (dHvA) and Shubnikov de Haas e ects (SdH) of Pb0.83Sn0.17Se crystals have been clearly seen in the temperature range from 30 K down to 1.7 K and magnetic eld as low as 2 T. The dHvA and SdH oscillations reveal single frequency of around 8 T which con rms the existence of a single Fermi surface cross section. In uence of isothermal annealing of Pb0.83Sn0.17Se crystals in Se vapours has been investigated. By increasing the annealing temperature from 433 oC up to 440 oC , transition from n to p-type conductivity has been observed. The dHvA and SdH e ects clearly re ect the existence of a nontrivial Berry's phase owing to the linear band dispersion which is the signature of a three- dimensional Dirac fermion in the Pb0.83Sn0.17Se crystals

Dirac semimetal

nije evidentirano