Pump-and-probe study in LaMnO 3 thin films
Pump-and-probe study in LaMnO 3 thin films
复制标题
LaMnO 3 薄膜中的泵浦和探针研究
DOI：
10.1103/physrevb.78.075119
复制
发表时间：
2008
影响因子：
3.7
通讯作者：
K. Miyano
中科院分区：
文献类型：
--
作者：
H. Tamaru;K. Ishida;N. Ogawa;Y. Kubo;K. Miyano
Subpicosecond time-resolved anisotropic transmission spectroscopy has been applied to one of the parent compounds of the colossal magnetoresistance manganites, orbital-ordered ${\text{LaMnO}}_{3}$, with and without the $A$-type antiferromagnetic order. ${\text{LaMnO}}_{3}$ is one of the simplest Mott insulators which facilitates unambiguous interpretation of the data. Two characteristic decay time constants are found; the fast one $({\ensuremath{\tau}}_{1})$ around 0.5 ps and the slow one $({\ensuremath{\tau}}_{2})$ around 10 ps. ${\ensuremath{\tau}}_{1}$ is the same above and below ${T}_{N}$ and is interpreted as the electron-phonon equilibration time. ${\ensuremath{\tau}}_{2}$ shows very slight increase below ${T}_{N}$. We interpret ${\ensuremath{\tau}}_{2}$ as the time constant for the orbital order to reach thermal equilibrium. The lack of a significant effect due to the magnetic order is explained using a recent band-structure calculation.
Subpicosecond time-resolved anisotropic transmission spectroscopy has been applied to one of the parent compounds of the colossal magnetoresistance manganites, orbital-ordered ${\text{LaMnO}}_{3}$, with and without the $A$-type antiferromagnetic order. ${\text{LaMnO}}_{3}$ is one of the simplest Mott insulators which facilitates unambiguous interpretation of the data. Two characteristic decay time constants are found; the fast one $({\ensuremath{\tau}}_{1})$ around 0.5 ps and the slow one $({\ensuremath{\tau}}_{2})$ around 10 ps. ${\ensuremath{\tau}}_{1}$ is the same above and below ${T}_{N}$ and is interpreted as the electron-phonon equilibration time. ${\ensuremath{\tau}}_{2}$ shows very slight increase below ${T}_{N}$. We interpret ${\ensuremath{\tau}}_{2}$ as the time constant for the orbital order to reach thermal equilibrium. The lack of a significant effect due to the magnetic order is explained using a recent band-structure calculation.