Fully band-resolved scattering rate in MgB2 revealed by the nonlinear hall effect and magnetoresistance measurements

Huan Yang, Yi Liu, Chenggang Zhuang, Junren Shi, Yugui Yao, Sandro Massidda, Marco Monni, Ying Jia, Xiaoxing Xi, Qi Li, Zi Kui Liu, Qingrong Feng, Hai Hu Wen

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Abstract

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.

Original languageEnglish (US)
Article number067001
JournalPhysical Review Letters
Volume101
Issue number6
DOIs
StatePublished - Aug 7 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Yang, H., Liu, Y., Zhuang, C., Shi, J., Yao, Y., Massidda, S., Monni, M., Jia, Y., Xi, X., Li, Q., Liu, Z. K., Feng, Q., & Wen, H. H. (2008). Fully band-resolved scattering rate in MgB2 revealed by the nonlinear hall effect and magnetoresistance measurements. Physical Review Letters, 101(6), [067001]. https://doi.org/10.1103/PhysRevLett.101.067001