Abstract
The ferromagnetic state of the spin-polarized ferromagnet La1−xSrxMnO3 is stabilized in the metallic region by strong coupling between localized spins in the t2g orbital and conduction electrons in the eg orbital. We prepared polycrystalline La1−xSrxMnO3 films (x = 0.15, 0.25, or 0.30) by deposition on an oxidized Si substrate. The three types of La1−xSrxMnO3 films were in the ferromagnetic rhombohedral phase, and their Curie temperatures, TC, evaluated from the midpoint of ac magnetization, were 305 K, 335 K, and 338 K, respectively. By applying expansion-mode acoustic vibration to the crystal structure of La1−xSrxMnO3, we observed a remarkable decrease (as large as 70 K) in TC. The applied structural perturbation causes a decrease in the possibility of conduction electron hopping and an increase in the Jahn–Teller distortion. The former is more effective for decreasing TC than the latter.
Highlights
External fields such as a magnetic field H, an electric field E, and a force tensor σ are associated with physical quantities such as magnetization M, electric polarization P, and a strain tensor ε, respectively
The three types of La1−xSrxMnO3 films were in the ferromagnetic rhombohedral phase, and their Curie temperatures, TC, evaluated from the midpoint of ac magnetization, were 305 K, 335 K, and 338 K, respectively
The characteristic ac magnetization at x = 0.15 is observed over a wide temperature range owing to non-negligible inhomogeneity, as seen in LaSr0.3MnO3 films deposited on Si by pulsed laser deposition
Summary
External fields such as a magnetic field H, an electric field E, and a force tensor σ are associated with physical quantities such as magnetization M, electric polarization (electrical conductivity) P, and a strain tensor ε, respectively. This strong correlation causes the giant magnetoresistance effect in the insulating region (x < 0.15) under Hdc.. In an FM metal for x = 0.30, piezo-elastic strain (PES) of +0.90% along [100], −0.23% along [011 ̄], and −0.70% along [011] causes TC to decrease by as much as ΔTC = −10 K,25 the magnitude of which is larger than that under HP compression for x = 0.30 (see Table I) This observation suggests that the change in TC depends on the type of structural change, i.e., hydrostatic compression or anisotropic compression accompanied by tensile and compressive strains. In this study on La1−xSrxMnO3 films, we expect a very large switching response, as shown in Figs. 1(b) and 1(c), owing to enhanced electron scattering
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