Premium
Interband Absorption in the Coloured Intermetallic Compounds PdIn
Author(s) -
Nomerovannaya L. V.,
Kirillova M. M.,
Shaikin A. B.
Publication year - 1980
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221020233
Subject(s) - intermetallic , indium , absorption (acoustics) , materials science , vanadium , brillouin zone , analytical chemistry (journal) , fermi level , alloy , dispersion (optics) , chemistry , condensed matter physics , optics , metallurgy , electron , physics , chromatography , quantum mechanics , composite material
The refractive, , and absorption, , indexes of six intermetallic PdIn compounds are measured in the spectral range of 0.248 to 17 μm by Beattie's polarimetric method, the indium concentra‐tion being 42, 44, 46, 48, 50, and 52 at%. All the compounds are single crystals. It is shown that as the indium concentration increases from 42 to 52 at%, the interband absorption peaks found at 0.15 to 0.17, 0.6 to 0.7, 2.2 to 2.65, and 2.6 to 3.2 eV shift towards lower energies, while that at 4.6 eV does not change its position with temperature and indium concentration. Comparison of the high‐frequency conductivity σ(ω) dispersion and the energy bands of equiatomic β′‐PdIn shows that the interband absorption at ω < 3 eV is caused by the electronic transitions from the Fermi level to vacant sp conductive states. The value of the spin‐orbit band splitting along the T‐direction of the Brillouin zone is estimated to be 0.15 to 0.17 eV.