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研究生:陳錦濤
研究生(外文):Chin-Tao Chen
論文名稱:鑭銪錳氧系統的A-type反鐵磁序,二維鐵磁擾動及其軌道有序之研究
論文名稱(外文):A-type antiferromagnetic order, 2D ferromagnetic fluctuation and orbital order in stoichiometric La1-xEuxMnO3
指導教授:古煥球
指導教授(外文):Huan-Chiu Ku
學位類別:碩士
校院名稱:國立清華大學
系所名稱:物理學系
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:50
中文關鍵詞:鑭銪錳氧軌道有序二維鐵磁序X光吸收光譜反鐵磁序
外文關鍵詞:A-type AF orderorbital order2D FM short range orderLaEuMnO3Mn K-edgeXANES
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本論文將討論磁性材料鑭銪錳氧化物(La1-xEuxMnO3) 系統及其他烯土族錳氧化物(RMO3)之結構、磁性及Mn離子的K吸收邊緣X光吸收光譜性質。
在單位化學式量體積,及A-type反鐵磁序尼爾轉變溫度(TN)範圍由鑭錳氧(LaMnO3)的139K到銪錳氧(EuMnO3)的42K,和小範圍的二維鐵磁擾動。構成軌道序的eg電子在反鐵磁序中形成一個很強的a-b平面鐵磁偶合,又t2g電子在c軸方向有一個很弱的反鐵磁性偶合,由這兩者的各向異性交互作用,使得鑭銪錳氧化物在低磁場中二維鐵磁轉變溫度高於尼爾轉變溫度。由於t2g電子會因為晶格場分裂和扭曲而變的更被局限的原因,所以隨著Eu的摻入係數x增加,二維鐵磁轉變溫度和尼爾轉變溫度會有不規則減少。另外,二維鐵磁轉變溫度和尼爾轉變溫度的值同時都隨著外加磁場的大小而變化,它們的轉變溫度在較高的外加磁場幾乎會合併。

Structural, magnetic and Mn K-edge X-ray absorption structure (XANES) spectrum studies for the La1-xEuxMnO3+d system and other rare earth manganite compounds are reported. The maximum formula unit volume Vf.u., appearance of A-type antiferromagnetic (AF) order with Néel temperature TN ranging from 139 K for LaMnO3 to 42 K for EuMnO3, and the two-dimensional (2D) ferromagnetic short-range fluctuation with T2D > TN in low field is the direct result of anisotropic superexchange interaction for the A-type AF order with strong basal plane ferromagnetic coupling of the orbital-ordered eg electrons (with orbital ordering temperature TOO > room temperature) and weak c-axis antiferromagnetic coupling of t2g electrons. The anomalous decreasing of T2D and TN with increasing Eu parameter x is due to more localized t2g electrons from stronger crystal field splitting and lattice distortion. Both T2D and TN are field dependent and nearly merges at higher applied field.

Abstract (Chinese)
Abstract
Contents
List of Figures and Tables
Acknowledgments
Chapter 1 Introduction
1.1 The parent compound of CMR materials-LaMnO3
1.2 The reason of choosing Eu
1.3 The structure of RMnO3
Chapter 2 Experimental Details
2.1 Sample preparation
2.2 Powder X-ray Diffraction Measurement
2.3 Magnetization and Magnetic Susceptibility Measurement
2.4 X-ray Absorption Near-edge Structure (XANES) Measurements
Chapter 3 Results and Discussions
3.1 Structural analysis
3.2 Magnetic Properties of La1-xEuxMnO3 system
3.3 Magnetic Properties of other rare earth manganites compounds
3.4 The Mn K-edge X-ray near-edge structure (XANES) study
Chapter 4 Conclusion
References
Appendix

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