Observation of diamagnetic effect in BaSnO3 via low-temperature magneto-photoluminescence spectroscopy.

Photoluminescence measurements for pure BaSnO₃ are carried out at low temperatures and high magnetic fields, down to 4 K and up to 8 T, respectively. Multiple phonon replicas are observed in the near-infrared region, which allows for a quantitative estimation of the Huang-Rhys factor, . Due to the extremely narrow linewidth, a magnetic-field–induced nonlinear blueshift of the zero phonon line (ZPL) and a small increase of the phonon energy are clearly distinguishable. The magnetic-field dependence of the ZPL energies can be interpreted in terms of diamagnetic effects of the s-like local electronic state. The electron effective mass value of 0.14m₀ is extracted from the best fitting. [ABSTRACT FROM AUTHOR]