2008/02/29 by Huan Yang, Yi Liu, Chenggang Zhuang +13 · 2 citations
Materials Science · Physics and Astronomy · #Ab initio #Boltzmann equation #Condensed matter physics #Iron-based superconductors research #Magnetoresistance #Materials science #Optics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Scattering #Superconductivity in MgB2 and Alloys #Thermodynamics #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.101.067001
published as Phys. Rev. Lett. 101, 067001 (2008) · 4 pages, 4 figures
openalex publication_date 2008/08/07 · arxiv created 2008/08/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have measured the normal state temperature dependence of the Hall effect and magnetoresistance in epitaxial MgB2 thin films with variable disorders characterized by the residual resistance ratio RRR ranging from 4.0 to 33.3. A strong nonlinearity of the Hall effect and magnetoresistance have been found in clean samples, and they decrease gradually with the increase of disorders or temperature. By fitting the data to the theoretical model based on the Boltzmann equation and ab initio calculations for a four-band system, for the first time, we derived the scattering rates of these four bands at different temperatures and magnitude of disorders. Our method provides a unique way to derive these important parameters in multiband systems.