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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.22017 |
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| _version_ | 1866914503422115840 |
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| author | McLanahan, M. L. Ramirez, A. P. |
| author_facet | McLanahan, M. L. Ramirez, A. P. |
| contents | We measure the colossal permittivity in single crystal Fe$_2$TiO$_5$ using broadband spectroscopy in the frequency range 20 Hz - 1 MHz. The relaxation response is analyzed using a Debye-like model with Arrhenius activation in two different ways and yields an energy barrier of 286.1 $\pm$ 2.8 meV. DC transport yields an activation energy of 288.8 $\pm$ 2.8 meV. These results strongly imply that the energy barrier for localized dipole motion and itinerant charge transport originate from the same atom-level forces. A further implication is that colossal dielectric behavior is a microscopic bulk phenomenon arising from a system on brink of metallicity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_22017 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | How Electrons Become Mobile in a Colossal Dielectric -- Fe$_2$TiO$_5$ McLanahan, M. L. Ramirez, A. P. Materials Science We measure the colossal permittivity in single crystal Fe$_2$TiO$_5$ using broadband spectroscopy in the frequency range 20 Hz - 1 MHz. The relaxation response is analyzed using a Debye-like model with Arrhenius activation in two different ways and yields an energy barrier of 286.1 $\pm$ 2.8 meV. DC transport yields an activation energy of 288.8 $\pm$ 2.8 meV. These results strongly imply that the energy barrier for localized dipole motion and itinerant charge transport originate from the same atom-level forces. A further implication is that colossal dielectric behavior is a microscopic bulk phenomenon arising from a system on brink of metallicity. |
| title | How Electrons Become Mobile in a Colossal Dielectric -- Fe$_2$TiO$_5$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2604.22017 |