Effects of magnetic field and light illumination on the electrical transport properties of La 7/8 Sr 1/8 MnO3 thin film grown on a Si substrate are investigated. The film shows an insulator-metal transition at 𝑇𝑃 ≈ 191.9 K and a low-temperature resistance minimum at 𝑇min ≈ 48 K in darkness. Both magnetic field and light illumination shift the insulator-metal transition temperature 𝑇𝑃 to be higher, while the low-temperature transport properties of the film induced by them show different trends. That is, the magnetic field and light illumination make the 𝑇min shift to lower and higher temperatures, respectively. The enhancement of both 𝑇𝑃 and 𝑇min under light illumination could be explained in terms of photoinduced hole-doping and demagnetization effects of La 7/8 Sr 1/8 MnO3.

No abstract