A relatively pure and perfect Weyl semimetal Mo0.5W0.5Te2 single crystal was synthesized, and its electrical resistivity, galvanomagnetic properties at temperatures from 4.2 to 80 K in fields up to 10 T, as well as optical properties at room temperature were studied. It is shown that the temperature dependence of the resistivity has a metallic type. At T = 4.2 K and in a 10 T field, the magnetoresistance reaches 29%, monotonously decreasing with temperature. Analysis of the field and temperature dependences of the magnetoresistance suggests that the Fermi surface of Mo0.5W0.5Te2 can contain both open and closed sheets. Studies of the Hall effect and estimates made on this basis showed that the main charge carriers are electrons with a concentration of ∼ 1020 cm-3 and mobility of ∼ 151 cm2/V.s at T = 4.2 K. With an increase in temperature, the concentration of current carriers increases, and their mobility decreases. Optical studies demonstrate that the Mo0.5W0.5Te2 single crystal has no features typical of metals. Interband absorption of light dominates over the entire studied spectral region. The appearance of a weak contribution from free carriers is noted at energies of less than 0.6 eV.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)