Low-temperature properties ofLa1−xCaxMnO3single crystals: Comparison withLa1−xSrxMnO3
| Autor: | Atsushi Asamitsu, Tetsuji Okuda, Yasuhiro Tokura, Y. Tomioka |
|---|---|
| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Physical Review B. 61:8009-8015 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | We have investigated, in single crystals of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3},$ the insulator-metal (IM) transition at the ground state induced by carrier doping or applying pressure around the critical doping level ${(x}_{c}\ensuremath{\approx}0.22).$ The up turn of the resistivity in the IM critical region has been found under a pressure below the Curie temperature ${(T}_{C})$ perhaps due to the proximity to the orbital-ordered ferromagnetic insulating phase. Around the IM transition the additional ${T}^{3}$ and ${T}^{1.5}$ components are clearly observed in the specific heat, while the ${T}^{2}$ coefficient of the resistivity and the residual resistivity is much enhanced in the metallic region in the vicinity of the transition. These results reveal the subsistence of the charge/orbital correlation in the metallic ground state. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|