TY - JOUR
T1 - Charge dynamics in thermally and doping induced insulator-metal transitions of (Ti1-xVx)2O3
AU - Uchida, M.
AU - Fujioka, J.
AU - Onose, Y.
AU - Tokura, Y.
PY - 2008/8/8
Y1 - 2008/8/8
N2 - Charge dynamics of (Ti1-xVx)2O3 with x=0-0.06 has been investigated by measurements of charge transport and optical conductivity spectra in a wide temperature range of 2-600 K with the focus on the thermally and doping induced insulator-metal transitions (IMTs). The optical conductivity peaks for the interband transitions in the 3d t2g manifold are observed in both the insulating and metallic states, while their large variation (by ∼0.4eV) with change of temperature and doping level scales with that of the Ti-Ti dimer bond length, indicating the weakened singlet bond in the course of IMTs. The thermally and V-doping induced IMTs are driven with the increase in carrier density by band crossing and hold doping, respectively, in contrast with the canonical IMT of correlated oxides accompanied by the whole collapse of the Mott gap.
AB - Charge dynamics of (Ti1-xVx)2O3 with x=0-0.06 has been investigated by measurements of charge transport and optical conductivity spectra in a wide temperature range of 2-600 K with the focus on the thermally and doping induced insulator-metal transitions (IMTs). The optical conductivity peaks for the interband transitions in the 3d t2g manifold are observed in both the insulating and metallic states, while their large variation (by ∼0.4eV) with change of temperature and doping level scales with that of the Ti-Ti dimer bond length, indicating the weakened singlet bond in the course of IMTs. The thermally and V-doping induced IMTs are driven with the increase in carrier density by band crossing and hold doping, respectively, in contrast with the canonical IMT of correlated oxides accompanied by the whole collapse of the Mott gap.
UR - http://www.scopus.com/inward/record.url?scp=49749128032&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=49749128032&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.101.066406
DO - 10.1103/PhysRevLett.101.066406
M3 - Article
AN - SCOPUS:49749128032
VL - 101
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 6
M1 - 066406
ER -