| Effect of Ga doping on charge transport mechanism of La0.85Zr0.15Mn1−xGaxO3 | |
|---|---|
| 學年 | 97 |
| 學期 | 2 |
| 出版（發表）日期 | 2009-04-01 |
| 作品名稱 | Effect of Ga doping on charge transport mechanism of La0.85Zr0.15Mn1−xGaxO3 |
| 作品名稱（其他語言） | |
| 著者 | Ling, D. C.; Cheng, J. H.; Lee, C. L.; Chien, F.Z. |
| 單位 | 淡江大學物理學系 |
| 出版者 | College Park: American Institute of Physics |
| 著錄名稱、卷期、頁數 | Journal of Applied Physics 105(7), 07D723(3pages) |
| 摘要 | Structural properties, temperature-dependent resistivity ρ(T) and thermoelectric power S(T) of La0.85Zr0.15Mn1−xGaxO3 (LZMGO) manganites with 0.0 ≤ x ≤ 0.06 have been extensively investigated. It is found that the Mn–O–Mn bond angle decreases and the Mn–O bond length increases with increasing Ga content, indicative of a significant distortion of MnO6 octahedra in LZMGO. The local lattice distortion and suppression of double exchange ferromagnetism induced by the Ga doping shift both Curie temperature (TC) and metal-insulator transition temperature (TMI) toward lower temperatures. Followed by the metal-insulator transition, ρ(T) exhibits an insulatinglike behavior accompanied by a relatively small value of S(T) below T∗ at low temperatures. An anomalous peak observed in S(T) is attributed to an enhancement of electron-magnon interaction caused by the Ga doping and a decrease in magnetic entropy near TMI. Three different charge transport mechanisms were identified in three temperature regions based on detailed analyses of ρ(T) and S(T) data. The small-polaron hopping mechanism governs the charge transport in the high-temperature paramagnetic region (T＞TMI). The polaron binding energy determined from the ρ(T) and S(T) data increases with increasing Ga content, suggesting that polaron in La0.85Zr0.15MnO3 has a magnetic nature. In addition, the electron-magnon scattering dominates the charge transport in the intermediate-temperature metallic region (T∗＜T＜TMI), whereas the transport behavior in the low-temperature insulating region (T＜T∗) can be described by the three-dimensional variable-range-hopping model. |
| 關鍵字 | |
| 語言 | en |
| ISSN | 0021-8979; 1089-7550 |
| 期刊性質 | |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | Ling, D. C. |
| 審稿制度 | |
| 國別 | USA |
| 公開徵稿 | |
| 出版型式 | 紙本 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/72758 ) |
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