| Issue |
Europhys. Lett.
Volume 53, Number 5, March 2001
|
|
|---|---|---|
| Page(s) | 673 - 679 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00204-2 | |
| Published online | 01 December 2003 | |
Nonlinear contributions to the quasistatic and the first-harmonic dielectric response in relaxor systems
Jožef Stefan Institute - P.O. Box 3000, 1001 Ljubljana,
Slovenia
Received:
10
April
2000
Accepted:
18
December
2000
Nonlinear dielectric response in relaxor systems was studied as a function of the
ac and dc electric field. Significant frequency dependence was found in the nonlinearity
a3. The crossover temperature dependence of a3 -a fingerprint of the
spherical glass freezing-was
confirmed to exist even in the static limit.
Beside the expected reflection of the third
harmonic component 
additional nonlinear contribution
was found in the nonlinear dependence of the first harmonic
response 
.
It is shown that this second contribution to the field dependence of
and also the quasistatic measurements of the nonlinear dielectric response
throughout the glassy-to-ferroelectric crossover region can be described by
the spherical random-bond-random-field model of relaxor ferroelectrics.
PACS: 78.20.Ci – Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity) / 64.70.Pf – Glass transitions / 77.84.Dy – Niobates, titanates, tantalates, PZT ceramics, etc
© EDP Sciences, 2001
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