Electronic properties of a PtGa sub 2 single crystal and photoemission studies of the electron-correlation effects in the Ni-Ga and the Ni-In intermetallic compounds
Thesis/Dissertation
·
OSTI ID:5215700
The electrical resistivity magnetic susceptibility thermoelectric power (S), and specific heat of a PtGa{sub 2} single crystal were measured as a function of temperature (T). The metallic behavior of this intermetallic compound is shown from the room-temperature resistivity value and the linear dependence of the S vs. T curve at temperatures above the Debye temperature. The diamagnetic susceptibility is independent of T. The electronic structures and the electron-correlation effects of nine Ni-Ga and Ni-In intermetallic compounds were studied by x-ray photoemission spectroscopy (XPS). Ultraviolet photoemission spectroscopy (UPS) was used to further investigate the many-body effects, especially the resonant behavior of the 6-eV satellite, in NiGa. The satellites on the high binding energy side of both valence-band (VB) and core level XPS spectra of these compounds decrease in intensity on alloying, which is related to the d-band filling. However, a complete filling of the Ni 3d band by alloying with Ga or In cannot be inferred. The VB satellite is resonantly enhanced near the 3p threshold (hv = 67 eV), and its centroid position is photon energy dependent.
- Research Organization:
- California Univ., Los Angeles, CA (USA)
- OSTI ID:
- 5215700
- Country of Publication:
- United States
- Language:
- English
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