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Anomalous polarization reversal in strained thin films of CuIn⁢P2⁢S6

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4];  [5];  [6]
  1. NAS of Ukraine, Kyiv (Ukraine). Inst. of Physics
  2. NAS of Ukraine, Kyiv (Ukraine). Inst. of Problems for Material Sciences
  3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  4. Taras Shevchenko National University of Kyiv (Ukraine)
  5. Uzhhorod University (Ukraine)
  6. Univ. of Tennessee, Knoxville, TN (United States)
+ Show Author Affiliations

Strain-induced transitions of polarization reversal in thin films of a ferrielectric CuIn⁢P2⁢S6 (CIPS) with ideally conductive electrodes are explored using the Landau-Ginzburg-Devonshire approach with an eighth-order free energy expansion in polarization powers. Due to multiple potential wells, the height and position of which are temperature and strain dependent, the energy profiles of CIPS can flatten in the vicinity of the nonzero polarization states. Thereby, we reveal an unusually strong effect of a mismatch strain on the out-of-plane polarization reversal, hysteresis loop shape, dielectric susceptibility, and piezoelectric response of CIPS films. By varying the sign of the mismatch strain and its magnitude in a fairly narrow range, quasistatic hysteresisless paraelectric curves can transform into double, triple, and other types of pinched and single hysteresis loops. The strain effect on the polarization reversal is opposite, i.e., anomalous, in comparison with many other ferroelectric films, for which the out-of-plane remanent polarization and coercive field increase strongly for tensile strains and decrease or vanish for compressive strains. For definite values of temperature and mismatch strain, the low-frequency hysteresis loops of polarization may exhibit negative slope in a relatively narrow range of external field amplitude and frequency. The low-frequency susceptibility hysteresis loops, which correspond to the negative slope of polarization loops, contain only positive values, which can be giant in the entire range of field changes. In conclusion, the corresponding piezoresponse also reaches giant values, being maximal near coercive fields.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Academy of Sciences of Ukraine
Grant/Contract Number:
SC0021118
OSTI ID:
3003205
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 108; ISSN 2469-9969; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

Dielectric properties
Electric polarization
Ferroelectricity
Landau-Ginzburg-Devonshire theory
Phase diagrams
Phase transitions
Piezoelectricity
Strain
Thin films