Lappeenranta-Lahti Univerisity of Technology Fondation

Investigation of the Hall effect and electrical magnetoresistance of solid solutions
in high magnetic fields up to 30 T
Project Team Prof. A.V. Dolbin
   
Period 2023 - 2026
   
Summary: Temperature dependences of electrical resistance of YBa2Cu3O7–δ films were measured in magnetic fields up to 8 T. For the  first  time,  within  the  framework  of  a  local  pair  model, the evolution of the temperature dependence of the pseudogap Δ*(T)  under  the  influence  of  a  magnetic  field  was  studied in detail. A significant increase in the size of local pairs under the influence of a magnetic field was revealed.

The temperature dependencies of the electrical resistance of the Bi88.08Mn11.92 solid solution in the temperature range of 2÷300 K and magnetic fields up to 90 kOe, for both cases, when H is perpendicular or parallel to I, have been studied for the first time. It has been established that the magnetoresistance (ΔR/R0) for Bi88.08Mn11.92 is positive in the entire temperature range studied and reaches a value of 3290% in a magnetic field of 90 kOe for H, that is perpendicular to I, which is about 400%. It is proposed that all features of the R(T) and ΔR/R0 (T) dependencies of Bi88.08Mn11.92 are largely due to the influence of the internal magnetism of the α -BiMn phase and can be explained within the framework of multiband theory. 
 
   
Selected publications

https://doi.org/10.1063/10.0025295