TY - JOUR
T1 - Electron-phonon interaction and charge carrier mass enhancement in SrTiO3
AU - van Mechelen, J.L.M.
AU - van der Marel, D.
AU - Grimaldi, C.
AU - Kuzmenko, A.B.
AU - Armitage, N.P.
AU - Reyren, N.
AU - Hagemann, H.
AU - Mazin, I.I.
PY - 2008/6/6
Y1 - 2008/6/6
N2 - We report a comprehensive THz, infrared and optical study of Nb-doped SrTiO3 as well as dc conductivity and Hall effect measurements. Our THz spectra at 7 K show the presence of an unusually narrow (<2meV) Drude peak. For all carrier concentrations the Drude spectral weight shows a factor of three mass enhancement relative to the effective mass in the local density approximation, whereas the spectral weight contained in the incoherent midinfrared response indicates that the mass enhancement is at least a factor two. We find no evidence of a particularly large electron-phonon coupling that would result in small polaron formation.
AB - We report a comprehensive THz, infrared and optical study of Nb-doped SrTiO3 as well as dc conductivity and Hall effect measurements. Our THz spectra at 7 K show the presence of an unusually narrow (<2meV) Drude peak. For all carrier concentrations the Drude spectral weight shows a factor of three mass enhancement relative to the effective mass in the local density approximation, whereas the spectral weight contained in the incoherent midinfrared response indicates that the mass enhancement is at least a factor two. We find no evidence of a particularly large electron-phonon coupling that would result in small polaron formation.
UR - http://www.scopus.com/inward/record.url?scp=45149114096&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.100.226403
DO - 10.1103/PhysRevLett.100.226403
M3 - Article
AN - SCOPUS:45149114096
SN - 0031-9007
VL - 100
JO - Physical Review Letters
JF - Physical Review Letters
IS - 22
M1 - 226403
ER -