S Suga, T Matsushita, M Tsunekawa, T Iwasaki, J Samejima, Y Kuwata, A Kimura, A Sekiyama, A Fujimori, H Ishii, T Miyahara, H Kuwahara, Y Tokura
PHYSICA B 237 413-414 1997年7月
High-resolution photoemission spectra are measured by changing the sample temperature from 290 K down to 11-15 K under the off- and on-resonance excitations for the Mn 2p, O 1s and Nd 3d states. Three Mn 3d-derived valence band features are clearly revealed in the on-resonance spectrum at room temperature for the Mn 2p core excitation. Among them, the step-like structure just below the Fermi level (E-F), which is thought to be the e(g) state, is suppressed at low temperatures. Observed energy shifts and spectral changes of the whole valence band upon changing the temperature are qualitatively discussed.