Dielectric to pyroelectric phase transition induced by defect migration
Subjecting strontium titanate single crystals to an electric field in the order of 10 ^6 V m ^−1 is accompanied by a distortion of the cubic crystal structure, so that inversion symmetry vanishes and a polar phase is established. Since the polar nature of the migration-induced field-stabilized polar...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2015-01-01
|
| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/17/2/023036 |
| _version_ | 1797751188232339456 |
|---|---|
| author | Juliane Hanzig Erik Mehner Sven Jachalke Florian Hanzig Matthias Zschornak Carsten Richter Tilmann Leisegang Hartmut Stöcker Dirk C Meyer |
| author_facet | Juliane Hanzig Erik Mehner Sven Jachalke Florian Hanzig Matthias Zschornak Carsten Richter Tilmann Leisegang Hartmut Stöcker Dirk C Meyer |
| author_sort | Juliane Hanzig |
| collection | DOAJ |
| description | Subjecting strontium titanate single crystals to an electric field in the order of 10 ^6 V m ^−1 is accompanied by a distortion of the cubic crystal structure, so that inversion symmetry vanishes and a polar phase is established. Since the polar nature of the migration-induced field-stabilized polar (MFP) phase is still unclear, the present work investigates and confirms the pyroelectric structure. We present measurements of thermally stimulated and pyroelectric currents that reveal a pyroelectric coefficient p _MFP in the order of 30 μC K ^−1 m ^−2 . Therefore, a dielectric to pyroelectric phase transition in an originally centrosymmetric crystal structure with an inherent dipole moment is found, which is induced by defect migration. From symmetry considerations, we derive space group $P4mm$ for the MFP phase of SrTiO _3 . The entire electroformation cycle yields additional information about the directed movement and defect chemistry of oxygen vacancies. |
| first_indexed | 2024-03-12T16:44:52Z |
| format | Article |
| id | doaj.art-c225842c2f934c50900645817c8325cf |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:44:52Z |
| publishDate | 2015-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-c225842c2f934c50900645817c8325cf2023-08-08T14:18:22ZengIOP PublishingNew Journal of Physics1367-26302015-01-0117202303610.1088/1367-2630/17/2/023036Dielectric to pyroelectric phase transition induced by defect migrationJuliane Hanzig0Erik Mehner1Sven Jachalke2Florian Hanzig3Matthias Zschornak4Carsten Richter5Tilmann Leisegang6Hartmut Stöcker7Dirk C Meyer8Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, GermanyInstitut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, GermanyInstitut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, GermanyInstitut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, GermanyInstitut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, Germany; Institut für Ionenstrahlphysik und Materialforschung , Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, GermanyInstitut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, Germany; Deutsches Elektronen-Synchrotron, Photon-Science , Notkestraße 85, 22607 Hamburg, GermanyFraunhofer-Technologiezentrum Halbleitermaterialien , Am St.-Niclas-Schacht 13, 09599 Freiberg, GermanyInstitut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, GermanyInstitut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, GermanySubjecting strontium titanate single crystals to an electric field in the order of 10 ^6 V m ^−1 is accompanied by a distortion of the cubic crystal structure, so that inversion symmetry vanishes and a polar phase is established. Since the polar nature of the migration-induced field-stabilized polar (MFP) phase is still unclear, the present work investigates and confirms the pyroelectric structure. We present measurements of thermally stimulated and pyroelectric currents that reveal a pyroelectric coefficient p _MFP in the order of 30 μC K ^−1 m ^−2 . Therefore, a dielectric to pyroelectric phase transition in an originally centrosymmetric crystal structure with an inherent dipole moment is found, which is induced by defect migration. From symmetry considerations, we derive space group $P4mm$ for the MFP phase of SrTiO _3 . The entire electroformation cycle yields additional information about the directed movement and defect chemistry of oxygen vacancies.https://doi.org/10.1088/1367-2630/17/2/023036pyroelectricitydefect migrationphase transition77.70.+a77.84.Bw72.80.Ga |
| spellingShingle | Juliane Hanzig Erik Mehner Sven Jachalke Florian Hanzig Matthias Zschornak Carsten Richter Tilmann Leisegang Hartmut Stöcker Dirk C Meyer Dielectric to pyroelectric phase transition induced by defect migration New Journal of Physics pyroelectricity defect migration phase transition 77.70.+a 77.84.Bw 72.80.Ga |
| title | Dielectric to pyroelectric phase transition induced by defect migration |
| title_full | Dielectric to pyroelectric phase transition induced by defect migration |
| title_fullStr | Dielectric to pyroelectric phase transition induced by defect migration |
| title_full_unstemmed | Dielectric to pyroelectric phase transition induced by defect migration |
| title_short | Dielectric to pyroelectric phase transition induced by defect migration |
| title_sort | dielectric to pyroelectric phase transition induced by defect migration |
| topic | pyroelectricity defect migration phase transition 77.70.+a 77.84.Bw 72.80.Ga |
| url | https://doi.org/10.1088/1367-2630/17/2/023036 |
| work_keys_str_mv | AT julianehanzig dielectrictopyroelectricphasetransitioninducedbydefectmigration AT erikmehner dielectrictopyroelectricphasetransitioninducedbydefectmigration AT svenjachalke dielectrictopyroelectricphasetransitioninducedbydefectmigration AT florianhanzig dielectrictopyroelectricphasetransitioninducedbydefectmigration AT matthiaszschornak dielectrictopyroelectricphasetransitioninducedbydefectmigration AT carstenrichter dielectrictopyroelectricphasetransitioninducedbydefectmigration AT tilmannleisegang dielectrictopyroelectricphasetransitioninducedbydefectmigration AT hartmutstocker dielectrictopyroelectricphasetransitioninducedbydefectmigration AT dirkcmeyer dielectrictopyroelectricphasetransitioninducedbydefectmigration |