Abstract
The temperature dependence of the residual polarization of the nonergodic relaxation state (NERS) obtained from the measurements of pyroelectric current during zero-field heating (ZFH) in the temperature interval from 10 to 295 K is investigated for the Cd2Nb2O7 relaxation system in two cases: (1) after sample cooling in a constant electric field E (FC) from T = 295 K to a preset temperature, which is much lower than the “freezing” temperature of the relaxation state (T f ≈ 182 K), field removal, and subsequent cooling in zero field (ZFC) to T = 10 K and (2) after ZFC from T = 295 K to the same temperature below T f , application of the same field, and FC to T = 10 K. The behavior of the P FC r (T) and P ZFC r (T) dependences is analyzed. In the field E < 2 kV/cm, the P ZFC r curves as functions of 1/T have a broad low-intensity peak in the region T ≈ T f , which vanishes in stronger fields, when the P FC r (1/T) curves intersect at T ≈ T f and have no anomalies. The difference in the behavior of P ZFC r (T) and P FC r (T) indicates the difference in the nature of NERS formed during ZFC and FC of the system upon a transition through T f . In the ZFC mode, NERS exhibits glasslike behavior; in the FC regime, features of the ferroelectric behavior even in the weak field. Analogous variations of P ZFC r (T) and P FC r (T) in a classical ferroelectric KDP are also given for comparison.
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Translated from Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, Vol. 127, No. 5, 2005, pp. 1091–1098.
Original Russian Text Copyright © 2005 by Kolpakova, Czarnecki.
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Kolpakova, N.N., Czarnecki, P. Nonergodic state of relaxation ferroelectric Cd2Nb2O7 in a constant electric field. J. Exp. Theor. Phys. 100, 964–970 (2005). https://doi.org/10.1134/1.1947319
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DOI: https://doi.org/10.1134/1.1947319