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Pressure Dependence of the Birefringence in AgGaS 2
Author(s) -
Nakanishi M.,
Yamamoto S.,
Matsuhashi T.,
Goshima D.,
Nakahara J.
Publication year - 2001
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 - 10.1002/1521-3951(200101)223:1<325::aid-pssb325>3.0.co;2-2
Subject(s) - birefringence , valence (chemistry) , tetragonal crystal system , spectral line , hydrostatic pressure , condensed matter physics , band gap , oscillation (cell signaling) , optics , materials science , chemistry , physics , crystal structure , crystallography , thermodynamics , biochemistry , organic chemistry , astronomy
We measured the pressure dependence of polarized transmission spectra on AgGaS 2 at 2 K. These spectra show an oscillatory behavior around the zero‐birefringence energy E 0 where the ordinal and extraordinal refractive indices coincide. Using this oscillation we determined E 0 under hydrostatic pressures. From the difference of pressure dependences of E 0 and the energy gap for the upper valence band, it is expected that the pressure dependence of the energy gap for the next valence bands is smaller than that for the upper one. Thus the tetragonal crystal field splitting decreases with increasing pressure. We discuss it in terms of p–d hybridization in the valence bands.