教師資料查詢 | 類別: 期刊論文 | 教師: 張經霖 CHANG, HENRY CHING-LIN (瀏覽個人網頁)

標題:Effects of Ru substitution for Mn on La0.7Sr0.3MnO3 perovskites
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出版(發表)日期2007/07/15
作品名稱Effects of Ru substitution for Mn on La0.7Sr0.3MnO3 perovskites
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著者Wang, L. M.; Lai, Jian-hong; Wu, Jyh-iuan; Kuo, Y. K. ; 張經霖; Chang, C. L.
單位淡江大學物理學系
出版者American Institute of Physics (AIP)
著錄名稱、卷期、頁數Journal of Applied Physics 102(2), pp.023915
摘要We report the investigations of crystal structure, electrical resistivity , magnetization M, x-ray
photoelectron spectroscopy XPS, specific heat CP, thermal conductivity , and thermoelectric
power TEP on La0.7Sr0.3Mn1−xRuxO3 LSMRO compounds with x= 0 to 0.90. From the
analyzes of crystal structure and magnetization measurements, it is inferred that Ru should have a
mixed valence of Ru3+ and Ru4+ for LSMRO with low level of Ru substitution, and an additional
mixed valence of Ru4+ and Ru5+ with higher Ru substitution. Such a finding is further confirmed by
the XPS measurements. Besides, it is found that all measured physical properties undergo
pronounced anomalies due to the ferromagnetic-paramagnetic phase transition, and the observed
transport properties of LSMRO can be reasonably understood from the viewpoint of polaronic
transport. The Curie temperatures TC determined from the magnetization measurements are
consistently higher than those of the metal-insulator transitions TMI determined from the transport
measurements. By replacing Mn with Ru, both TC and TMI decrease concurrently and the studied
materials are driven toward the insulating phase with larger value of 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 of
the LSMRO perovskites.
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語言英文
ISSN0021-8979
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