SHG Microscopic Studies on Low Temperature Phase Transitions of SrTi 16 O 3 and SrTi 18 O 3
| Autor: | Noritaka Kato, Ryuhei Nakai, C. Ménoret, Yoshiaki Uesu, Miho Narahashi, Toru Kyomen, Mitsuru Itoh, Jean-Michel Kiat |
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| Rok vydání: | 2003 |
| Předmět: |
Phase transition
Materials science Quantum paraelectricity Condensed matter physics Second-harmonic generation Condensed Matter Physics Ferroelectricity Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Electric field Phase (matter) Strontium titanate Orthorhombic crystal system |
| Zdroj: | Ferroelectrics. 285:19-26 |
| ISSN: | 1563-5112 0015-0193 |
| DOI: | 10.1080/00150190390205834 |
| Popis: | Marked field-induced second harmonic generation was observed in SrTi 16 O 3 at liquid He temperature. The intensity decreased towards 35K with the increase of temperature but it still remained significantly above 35K and gradually diminished and vanished around 100K. This indicates that ferroelectric nano-regions exist in higher temperature region and grow under electric field. On the other hand, 18 O-replaced SrTiO 3 (SrTi 18 O 3 ) exhibited SHG below 30K without electric field and the intensity decreased steeply above the temperature. This corresponds to the appearance of ferroelectric phase. The point group of field-induced phase of SrTi 16 O 3 and ferroelectric phase of SrTi 18 O 3 is orthorhombic mm 2 with polar axis along the cubic {110} direction. |
| Databáze: | OpenAIRE |
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