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研究生:林逸誠
研究生(外文):Yi-Cheng Lin
論文名稱:新RuCa2RCu2O8(R=Pr,Nd,Sm,Eu,Gd)系統的超導及弱鐵磁性質之研究
論文名稱(外文):Superconductivity and weak-ferromagnetic order of the new RuCa2RCu2O8+d(R = Pr, Nd, Sm, Eu, Gd) system
指導教授:戴明鳳戴明鳳引用關係古煥球
指導教授(外文):Ming-Feng TaiHaun-Chiu Ku
學位類別:碩士
校院名稱:國立中正大學
系所名稱:物理系
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:2004
畢業學年度:92
語文別:中文
論文頁數:55
中文關鍵詞:超導弱鐵磁
外文關鍵詞:SuperconductivityWeak ferromagnetic order
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具有Ru-1212結構的新RuCa2RCu2O8+ (R = Pr, Nd, Sm, Eu, Gd) 系統,已發表為具有超導溫度介於23 ~ 44 K的超導體。
初步的研究指出此晶格為經由 RuSr2GdCu2O8 系統的tetragonal結構形變而成的orthorhombic結構。類似於 RuO6 的八面體和 CuO5 的角錐型原子排列單位,在磁性轉換溫度於49 K時,銅氧層和稀土層之間產生的超導和弱鐵磁共存。藉由場冷和零場冷量測的磁化強度隨外加磁場變化的關係可觀察到,因為弱鐵磁和超導的共存及相互作用,以及結構形變和樣品的氧含量濃度變化等變數,造成了低溫時的異常磁性性質。而在原子半徑較大的 La, Ce 中,則無發現超導性質或結構。
Superconducting onset Tc up to 23-44 K are reported for the new RuCa2RCu2O8+ (R = Pr, Nd, Sm, Eu, Gd) system with the Ru-1212 RuCa2PrCu2O8+-type structure. Preliminary study indicates that the crystal structure is an orthorhombic distortion of the tetragonal RuSr2GdCu2O8+-type structure (space group P4/mmm, Tm ~ 136 K, Tc(max) ~ 65 K). With similar RuO6 octahedral and CuO5 pyramidal units, superconductivity from the Cu-O bi-layers is apparently coexisting with the weak ferromagnetic (WFM) order with magnetic ordering temperature Tm ~ 49 K. Low temperature anomalous magnetic properties M(T,Ba) observed in both field-cooled (FC) and zero-field-cooled (ZFC) modes are closely related to the complex interplay and coexistence between weak ferromagnetic order and superconductivity as well as from structural distortion and sensitive sample oxygen concentration variation. No superconductivity or structure can be observed for larger rare earth compounds R = La and Ce.
Contents
Abstract
I
Chinese Abstract II
Acknowledgments III
Contents IV
List of Tables and Figures
VI
Chapter 1 Introduction 1
1-1 Summary 1
1-2 The study of RuSr2RCu2O8+ (R = Sm, Eu, Gd) system 2
1-2-1
1-2-2
1-3
Phase formation
Structure
Magnetic and electronics properties of RuSr2GdCu2O8+ 2
3
5
Chapter 2 Experimental Details 14
2.1 Sample Preparation 14
2.2 Powder X-ray Diffraction Measurement 14
2.3 Magnetization and Magnetic Susceptibility Measurement 16
2.4 Experimental procedure in magnetic time relaxation 19
2.5
Electrical Resistivity Measurement 20
Chapter 3 Results and Discussion 26
3-1 Phase Identification 26
3-2 Magnetic Measurements and Analysis 26
3-2-1 RuCa2PrCu2O8+ system 26
3-2-2
RuCa2RCu2O8+ (R = La, Ce, Pr, Nd, Sm, Eu, Gd) system 29
Chapter 4
Conclusion 52
References 53
Appendix 55
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