Home
page
Other articles
in this issue
|
Once More about Magnetogyration
(Case of the CdS, (Gax In1-x)2Se3,
SiO2 and Li2B4O7 Crystals)
Vlokh R., Vlokh O.G., Klymiv I., Adamenko D.
Institute of Physical Optics, 23 Dragomanov Str., 79005,
L’viv, Ukraine
download full version
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,
d333=5.7*10-11Oe-1
and a33=9.27*10-9Oe-1,
d333=2.45*10-10Oe-1
(x=0.3); a33=9.29*10-9Oe-1,
d333=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 |
|
References
1. Vlokh O.G.News of Lviv Univ. (1982) 16 5.
2. Zheludev I.S., Vlokh O.G., Sergatyook V.A. Ferroelectrics (1985)
63 97.
3. Vlokh O.G., Sergatyook V.A. Rep. Of Acad. Scins. of USSR (1986)
291 832. (in Russian)
4. Vlokh O.G., Sergatyook V.A. Ferroelectrics (1988) 80 313.
5. Vlokh O.G., Vlokh R.O. Optics and spectroscopy (1989) 69 225. (in
Russian).
6. Vlokh O.G., Vlokh R.O. Optics and spectroscopy (1990) 69 458.(in
Russian).
7. Vlokh R.O. Ukr. J. of Phys. (1989) 34 1809.
8. Krogh M.J. Acta Cryst. (1962) 15 190.
9. Kwon T.Y., Ju J.J., Cha J.W., Kim J.N., Yun S.I. Materials Lett.
(1994) 20 211.
10. Kranjcec M.,Desnika D.,Celustka B.,Borec A., Kovacs Gy., Hadmashy
Z., Suslikov L., Studenyak I. Phys.Stat.Sol.(a) (1996) 153 539. |