Using photoemission microscopy at submicron lateral resolution, we measured the occupied density of states in MgB2 single crystalline grains from commercial MgB2 powder. This experiment provided a reliable measurement of the integrated density of states in MgB2 directly comparable to the theoretical predictions. According to the conventional metallic nature of MgB2, with weak electron-electron correlation effects, we observe a close overall agreement between our photoemission valence- band spectrum and the calculated density of states. This is further supported by the analysis of the loss features in the B 1s photoemission spectrum. We also report evidence of a quick surface degradation due to the exposure to the synchrotron radiation beam.
Occupied density of states in mgb2 revealed by photomission microscopy
Larciprete R;
2002
Abstract
Using photoemission microscopy at submicron lateral resolution, we measured the occupied density of states in MgB2 single crystalline grains from commercial MgB2 powder. This experiment provided a reliable measurement of the integrated density of states in MgB2 directly comparable to the theoretical predictions. According to the conventional metallic nature of MgB2, with weak electron-electron correlation effects, we observe a close overall agreement between our photoemission valence- band spectrum and the calculated density of states. This is further supported by the analysis of the loss features in the B 1s photoemission spectrum. We also report evidence of a quick surface degradation due to the exposure to the synchrotron radiation beam.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
