Abstract
We report the transmittance (T) and the pump–probe transmittance change (ΔT) of Nd0.5Sr0.5MnO3 (NSMO) thin films grown on SrTiO3(STO)(100) and STO(110) substrates in 1.3–1.7eV range at room temperature. The strain of NSMO was isotropic on STO(100) and anisotropic on STO(110). Both T and ΔT showed no polarization dependence in NSMO/STO(100) but the intensity of T and ΔT was anisotropic in NSMO/STO(110). Also ΔT showed sharp exponential decay with increasing time delay between the pump and probe pulse. The short time decay behaviour (≲0.3ps) showed no significant polarization direction and substrate dependence, which indicates that the carrier–carrier scattering rate is not sensitive to the strain state in NSMO.
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