Temperature dependent percolation mechanism for conductivity in TiO3 revealed by a microstructure study
We have performed optical microscopy, micro-photoelectron spectroscopy, and micro-Raman scattering measurements on ${{\rm{Y}}}_{0.63}$ ${\mathrm{Ca}}_{0.37}$ TiO _3 single crystals in order to clarify the interplay between the microstructure and the temperature dependent electronic transport mechani...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2018-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/aae0cc |
| _version_ | 1797747223784587264 |
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| author | R German B Zimmer T C Koethe A Barinov A C Komarek M Braden F Parmigiani P H M van Loosdrecht |
| author_facet | R German B Zimmer T C Koethe A Barinov A C Komarek M Braden F Parmigiani P H M van Loosdrecht |
| author_sort | R German |
| collection | DOAJ |
| description | We have performed optical microscopy, micro-photoelectron spectroscopy, and micro-Raman scattering measurements on ${{\rm{Y}}}_{0.63}$ ${\mathrm{Ca}}_{0.37}$ TiO _3 single crystals in order to clarify the interplay between the microstructure and the temperature dependent electronic transport mechanisms in this material. Optical microscopy observations reveal dark and bright domain patterns on the surface with length scales of the order of several to a hundred micrometers showing a pronounced temperature dependent evolution. Spatially resolved photoelectron spectroscopy measurements show the different electronic character of these domains. Using micro-Raman spectroscopy, we observe a distinct temperature dependence of the crystal structure of these domains. On the basis of these findings the different domains are assigned to insulating and metallic volume fractions, respectively. By decreasing the temperature, the volume fraction of the conducting domains increases, hence allowing the electrons to percolate through the sample at temperatures lower than ∼150 K. |
| first_indexed | 2024-03-12T15:48:44Z |
| format | Article |
| id | doaj.art-3e44fe79b722476e93d6f52715770fb0 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:48:44Z |
| publishDate | 2018-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-3e44fe79b722476e93d6f52715770fb02023-08-09T15:19:14ZengIOP PublishingMaterials Research Express2053-15912018-01-0151212610110.1088/2053-1591/aae0ccTemperature dependent percolation mechanism for conductivity in TiO3 revealed by a microstructure studyR German0https://orcid.org/0000-0003-2792-4142B Zimmer1T C Koethe2A Barinov3A C Komarek4M Braden5F Parmigiani6P H M van Loosdrecht7II. Physikalisches Institut, University of Cologne , Zülpicher Straße 77, D-50937 Köln, GermanyII. Physikalisches Institut, University of Cologne , Zülpicher Straße 77, D-50937 Köln, GermanyII. Physikalisches Institut, University of Cologne , Zülpicher Straße 77, D-50937 Köln, GermanySincrotrone Trieste S.C.p.A. , Strada Statale 14-km 163,5 in AREA Science Park, 34149 Basovizza, Trieste, ItalyII. Physikalisches Institut, University of Cologne , Zülpicher Straße 77, D-50937 Köln, Germany; Max Planck Institute for Chemical Physics of Solids , Nöthnitzer Straße 40, 01187 Dresden, GermanyII. Physikalisches Institut, University of Cologne , Zülpicher Straße 77, D-50937 Köln, GermanyII. Physikalisches Institut, University of Cologne , Zülpicher Straße 77, D-50937 Köln, Germany; Sincrotrone Trieste S.C.p.A. , Strada Statale 14-km 163,5 in AREA Science Park, 34149 Basovizza, Trieste, Italy; Department of Physics, University of Trieste , Via A. Valerio 2, 34127 Trieste, ItalyII. Physikalisches Institut, University of Cologne , Zülpicher Straße 77, D-50937 Köln, GermanyWe have performed optical microscopy, micro-photoelectron spectroscopy, and micro-Raman scattering measurements on ${{\rm{Y}}}_{0.63}$ ${\mathrm{Ca}}_{0.37}$ TiO _3 single crystals in order to clarify the interplay between the microstructure and the temperature dependent electronic transport mechanisms in this material. Optical microscopy observations reveal dark and bright domain patterns on the surface with length scales of the order of several to a hundred micrometers showing a pronounced temperature dependent evolution. Spatially resolved photoelectron spectroscopy measurements show the different electronic character of these domains. Using micro-Raman spectroscopy, we observe a distinct temperature dependence of the crystal structure of these domains. On the basis of these findings the different domains are assigned to insulating and metallic volume fractions, respectively. By decreasing the temperature, the volume fraction of the conducting domains increases, hence allowing the electrons to percolate through the sample at temperatures lower than ∼150 K.https://doi.org/10.1088/2053-1591/aae0ccmetal-insulator transitontransition-metal compoundspercolationcorrelated electrons |
| spellingShingle | R German B Zimmer T C Koethe A Barinov A C Komarek M Braden F Parmigiani P H M van Loosdrecht Temperature dependent percolation mechanism for conductivity in TiO3 revealed by a microstructure study Materials Research Express metal-insulator transiton transition-metal compounds percolation correlated electrons |
| title | Temperature dependent percolation mechanism for conductivity in TiO3 revealed by a microstructure study |
| title_full | Temperature dependent percolation mechanism for conductivity in TiO3 revealed by a microstructure study |
| title_fullStr | Temperature dependent percolation mechanism for conductivity in TiO3 revealed by a microstructure study |
| title_full_unstemmed | Temperature dependent percolation mechanism for conductivity in TiO3 revealed by a microstructure study |
| title_short | Temperature dependent percolation mechanism for conductivity in TiO3 revealed by a microstructure study |
| title_sort | temperature dependent percolation mechanism for conductivity in tio3 revealed by a microstructure study |
| topic | metal-insulator transiton transition-metal compounds percolation correlated electrons |
| url | https://doi.org/10.1088/2053-1591/aae0cc |
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