Metal-insulator transition in ${La}_{1 - x}$ ${Sr}_{x}$ ${TiO}_{3}$ and $Y_{1 - x}$ ${Ca}_{x}$ ${TiO}_{3}$ investigated by specific-heat measurements

1 September 1993

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 48 (10) , 7636-7642
https://doi.org/10.1103/physrevb.48.7636

Abstract

The carrier-doping (or band-filling) dependence of electronic states has been investigated in the perovskitelike titanate compounds,

{La}_{1 - x}

{Sr}_{x}

{TiO}_{3}

and

Y_{1 - x}

{Ca}_{x}

{TiO}_{3}

, by measurements of the specific heat. The linear temperature coefficient of the electronic specific heat, γ, is enhanced significantly near the metal-insulator phase-transition boundary, indicating a divergent increase of the effective electron mass due to the strong electronic correlation on approaching the metal-insulator transition boundary. The result is argued in comparison with that of the high-

T_{c}

cuprates.

Keywords

This publication has 37 references indexed in Scilit:

Electronic structure of metallic oxides: Band-gap closure and valence control
Journal of Physics and Chemistry of Solids, 1992
Phase diagram of LaTiO x : from 2D layered ferroelectric insulator to 3D weak ferromagnetic semiconductor
Zeitschrift für Physik B Condensed Matter, 1991
Transport and magnetic properties of LaxSr1-xTiO3
Physica B: Condensed Matter, 1990
Band gaps and electronic structure of transition-metal compounds
Physical Review Letters, 1985
Magnetic behavior in the series LaxY1−xTiO3
Journal of Solid State Chemistry, 1982
Electrical resistivities of single-crystal PrTiO3 and NdTiO3. Magnetic properties of PrTiO3, NdTiO3, PrScO3, and NdScO3
Journal of Solid State Chemistry, 1981
Crystal growth and magnetic anisotropy of YTiO3
Materials Research Bulletin, 1981
Electron correlations in narrow energy bands III. An improved solution
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1964
Electron correlations in narrow energy bands. II. The degenerate band case
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1964
Electron correlations in narrow energy bands
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1963

Metal-insulator transition in La1−xSrxTiO3 and Y1−xCaxTiO3 investigated by specific-heat measurements

Abstract

Keywords

Metal-insulator transition in ${La}_{1 - x}$ ${Sr}_{x}$ ${TiO}_{3}$ and $Y_{1 - x}$ ${Ca}_{x}$ ${TiO}_{3}$ investigated by specific-heat measurements