本論文針對鈣鈦礦RCr0.85Mn0.15O3 (R = Pr、Sm、Gd、Ho)系列樣品，進行磁化強度(M)、熱導率(κ)以及比熱(CP)的量測，探討不同稀土離子(R3+)對上述物理性質的影響。磁化強度量測結果顯示樣品在低溫區呈現磁有序的反鐵磁性，而在高溫區則轉變為無序順磁性，且樣品反鐵磁-順磁相變溫度(Néel Temperature，TN)隨著稀土離子半徑減小而下降。此外，在量測數據中有觀察到磁化強度為負值的現象，推測是由於磁矩的排列受到磁矩間的交互作用影響，使內場與外加磁場方向相反所造成。
比熱量測結果顯示，TN隨著稀土離子半徑減小而下降，而熵值變化量隨稀土離子半徑減小而上升。熱傳導率實驗結果顯示，熱傳導率主要由晶格熱傳導貢獻，且在30 K處皆有因為聲子倒逆散射而產生的峰值，在低溫區段使用Debye-Callaway model來做擬合，擬合結果發現晶粒邊界散射的參數變化與低溫峰值變化一致。

In this thesis, we report the investigation of the temperature-dependent magnetization (M), thermal conductivity (κ), and specific heat (CP) on the RCr0.85Mn0.15O3 compounds with R = Pr, Sm, Gd, and Ho in the temperature range of 10 K to 300 K. The antiferromagnetic-paramagnetic transition temperature (TN) is found to shift towards lower temperatures with decreasing rare-earth ionic radius. It is noted that the magnetization is negative at low temperatures, presumably due to the interaction between the magnetic moments so that the direction of the internal field and the external field are opposite in the studied chromites.
The specific heat measurements show that the entropy change increases with the decrease of the rare-earth ionic radius. Besides, pronounced phonon peaks at about 30 K were observed for all samples, a result of the Umklapp process. The measured thermal conductivity can be satisfactorily described by the Debye-Callaway model between 10 K to 55 K.

致謝 I
摘要 III
Abstract V
標題目錄 VII
圖形目錄 IX
表目錄 XI
第一章 前言 1
1-1 簡介 1
第二章 材料特性研究 3
2-1 磁性理論 3
2-2 磁性種類 4
2-2-1 順磁性 (Paramagnetism) 5
2-2-2 逆磁性(Diamagnetism) 6
2-2-3 鐵磁性(Ferromagnetism) 7
2-2-4 反鐵磁性(Antiferromagnetism) 9
2-2-5 亞鐵磁性(Ferrimagnetism) 10
2-3 鈣鈦礦(Perovskite) 11
2-5-1 超交換作用(Super exchange) 14
2-5-2 DM作用(DM interaction) 15
第三章 實驗原理 17
3-1 熱傳導率 17
3-1-1 聲子對熱傳導的影響 18
3-1-2 電子對熱傳導的影響 22
3-2 比熱 24
3-3-1 電子比熱 24
3-2-2 聲子比熱 25
3-2-3 磁性比熱 26
第四章 實驗方法 29
4-1 量測系統與方法 29
4-1-1 低溫冷卻系統 29
4-1-2 熱傳導率的量測 31
4-2 實驗控制程式 32
4-3 比熱量測方法 39
4-3-1 運作頻率之選擇方法 44
第五章 實驗結果與分析 47
5-1 磁化強度對溫度(M-T)的量測分析 47
5-2 比熱對溫度的量測分析 55
5-3 熱傳導率對溫度的量測分析 58
第六章 結論 61
參考文獻 63

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