- 期刊
- OpenAccess
Anomalous Behavior in Ru-doped La0.7Sr0.3MnO3 Perovskites
並列摘要
We report the investigations of resistivity and specific heat on the colossal magnetoresistance (CMR) compound La0.7Sr0.3(Mn1-xRux)O3 as a function of temperature with x = 0 to 0.25. It is found that the specific heat undergoes pronounced peaks due to the ferromagnetic-paramagnetic phase transition in these compounds. However, the transition temperatures TC determined from the specific heat are consistently lower than that of the metal-insulator transitions TMI determined from the resistivity measurements. By replacing Mn with Ru, both TC and TMI concurrently decrease and the studied materials are driven toward to the insulating phase with larger x. It is also found that the entropy change during the phase transition is reduced with more Ru substitution. These observations indicate that the existence of Ru has the effect of weakening the ferromagnetism and metallicity to the La0.7Sr0.3MnO3 perovskite.
並列關鍵字
無資料延伸閱讀
- Chiang, F. K. (2011). Lattice, Spin, and Electronic Anisotropies in DyFe1-x MnxO3 Perovskites [doctoral dissertation, National Tsing Hua University]. Airiti Library. https://doi.org/10.6843/NTHU.2011.00141
- Nath, K. A., Chandra, K. P., Kulkarni, A. R., & Prasad, K. (2014). Electrical Properties of a Lead-Free Perovskite Ceramic: Ba(Gd_(1/2)Nb_(1/2))O_3. Advances in Ceramic Science and Engineering, 3(), 11-17. https://doi.org/10.14355/acse.2014.0301.02
- 廖鈺汝（2017）。Optical studies of perovskite oxides (SmBaMn2O6) and heterostructures (Nd0.35Sr0.65MnO3/YBa2Cu3O7)〔碩士論文，國立臺灣師範大學〕。華藝線上圖書館。https://doi.org/10.6345/NTNU202202012
- 曹哲維（2019）。Magnetic Phase Transition Behaviors of RVO4 (R = Tb, Ho, Lu) Single Crystal〔碩士論文，國立交通大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0030-0306202016380145
- Hsueh, A. C. (2018). Dielectric studies of double perovskites structure Ba2LnRuO6 (Ln = La, Pr and Nd) [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU201801762