| Once More about Magnetogyration (Case of the CdS, (Gax
In1-x)2Se3, SiO2 and Li2B4O7
Crystals)
Order
this article
R.Vlokh, O.G.Vlokh, I.Klymiv, D.Adamenko
The paper is devoted to the study of induced gyrotropy (Faraday type
and spatial dispersion type) by the magnetic field in crystals with different
point groups of symmetry and different optical absorption. According to
our experiments Li2B4O7 and SiO2 crystals do not possess magnetogyration
because in the first case wavelength of 632.8nm is far from absorption
age and in the second one magnetogyration is forbidden in such geometry
of experiment. Coefficients of the Faraday effect for Li2B4O7 and SiO2
crystals are a33=1.12*10-10Oe-1 and a33=1.13*10-10Oe-1, respectively.
But CdS and (GaxIn1-x)2Se3 (x = 0.3; 0.4) crystals that exhibit strong
absorption at l=632.8nm possess a sufficient magnetogyration effect.
Determined coefficients of the Faraday effect and magnetogyration for CdS
and (GaxIn1-x)2Se3 (x=0.3; 0.4) are a33=5.05*10-9Oe-1,
s333=5.7*10-11Oe-1
and a33=9.27*10-9Oe-1, s333=2.45*10-10Oe-1 (x=0.3); a33=9.29*10-9Oe-1,
s333=2.43*10-10Oe-1
(x = 0.4) respectively. It is interesting to note that in contrary to the
CdS crystals, CdS0.22Se0.78 and CdS0.4Se0.6 nanocrystals embedded in borosilicate
glass matrix possess only the Faraday effect (a33=2.06*10-10Oe-1
and a33=2.29*10-10Oe-1, respectively) that is in good agreement
with the symmetry conditions and our approach. Our present experiments
show that a magnetogyration effect exists in crystals only due to sufficient
absorption.
PACS: 78.20.Ls
doi 10.3116/16091833/3/2/166/2002 |
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