earticle

영어

When studying the properties of the high-temperature superconductor La2-xSrxCuO4 (LSCO), it is crucial to explore the superconducting phase, and the complex intertwined electronic structural phases. These materials are influenced by the degree of impurities and disorders. Growth methods such as molecular beam epitaxy (MBE) or pulsed laser deposition (PLD) possibly play important roles in reducing impurities or disorders. However, optical measurements including Raman spectroscopy has been limited to study thin film grown by MBE and PLD despite its wide applicability in strongly correlated materials. In this study, we utilized optimally doped LSCO (x=0.15) thin films grown by PLD to conduct electronic Raman scattering. Comparing these results with bulk LSCO (x=0.15), we observed clear differences from that of bulk samples. The phonon near 225 cm⁻¹ in the B1g Raman spectrum did not split and appeared as a single peak, and the two-magnon emerged in an energy range that had not been previously reported. These results indicate better crystal quality of PLD grown LSCO (x=0.15) which shows possible Two-magnon.