Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-03-09
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 6 figures
Scientific paper
LaTiO$_{3+\delta/2}$, NdTiO$_{3+\delta/2}$, and Nd$_{1-x}$Sr$_{x}$TiO$_{3+\delta/2}$ thin films have been epitaxially grown on (100)SrTiO$_{3}$ and (100)LaAlO$_{3}$ single crystal substrates by using the pulsed laser deposition technique. The oxygen pressure during deposition has been carefully controlled to ensure that the films are lightly doped in the metal side near the metal-Mott-insulator boundary. A steep drop of the effective carrier number at low temperatures has been observed in some of the films, which may correspond to a gradually opening of the Spin Density Wave (SDW) gap due to the antiferromagnetic spin fluctuations. At elevated temperatures, a thermally induced decrease of the Hall coefficient can also be clearly observed. In spite of the fact that these films were prepared from different materials in varied deposition conditions, the temperature dependence of their resistance can all be almost perfectly fitted by a small-polaron coherent conduction model ($R_s(T)=R_s(0)+C\omega_\alpha/\sinh^2(T_\omega/T)$). Careful investigation on the fitting parameters implies that the frequency of the phonon coupled to the electrons may be partially related to the lattice distortion induced by the mismatch strain of the substrates.
Li Jiying
Tian H. Y.
Wang F. B.
Wang Pei
Zhang Jian-Min
No associations
LandOfFree
Small-polaron coherent conduction in lightly doped ReTiO$_{3+ δ/2}$ (Re=La or Nd) thin films prepared by Pulsed Laser Deposition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Small-polaron coherent conduction in lightly doped ReTiO$_{3+ δ/2}$ (Re=La or Nd) thin films prepared by Pulsed Laser Deposition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Small-polaron coherent conduction in lightly doped ReTiO$_{3+ δ/2}$ (Re=La or Nd) thin films prepared by Pulsed Laser Deposition will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-710956