Ferroelectric-specific stark effect in stoichiometric LiNbO3:Fe at room temperature.
By means of EPR spectroscopy of LiNbO(3):Fe at room temperature (RT) it is shown that the Stark effect in ferroelectric crystals can be different from that observed in other materials. Novel properties appear when an external E field reverses the direction of the spontaneous polarization, the direction of the linear Stark shift stays the same with a reversal of the E field. The corresponding spectral line shifts can occur over a long time scale (hours). These properties seem to be a general feature of the Stark effect in ferroelectric crystals when the external E field exceeds the coercive field.
Basun
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A.F. Ioffe Physico-Technical Institute, RAS, 194021 St. Petersburg, Russia.
Bursian
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Evans
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Kaplyanskii
A A
AA
Razdobarin
A G
AG
Sochava
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LS