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| 研究生： |
吳俊毅 Wu, Chun-I |
|---|---|
| 論文名稱： |
應用共振軟X光散射研究罕德金屬YMn6Sn6 RIXS studies on the Hund's metal YMn6Sn6 |
| 指導教授： |
黃迪靖
Huang, Di-Jing |
| 口試委員: |
杜昭宏
Du, Chao-Hung 蘇雲良 SOO, Yun-Liang |
| 學位類別： |
碩士 Master |
| 系所名稱： |
理學院 - 先進光源科技學位學程 Degree Program of Science and Technology of Synchrotron Light Source |
| 論文出版年： | 2023 |
| 畢業學年度： | 111 |
| 語文別： | 英文 |
| 論文頁數： | 57 |
| 中文關鍵詞： | 共振非彈性散射 、罕德金屬 、類螢光激發 、類拉曼激發 |
| 外文關鍵詞： | Hund's metal, fluorescence-like excitation, Raman-like excitation, YMn6Sn6 |
| 相關次數： | 點閱：1 下載：0 |
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許多過度金屬材料中，電子強關聯性扮演重要的角色。由於顯著的庫倫斥力和能帶寬度的縮減，電子變得局域化，導致材料表現出莫特(Mott)絕緣特性。然而，在多軌道材料中，原子內電子自旋的“交換作用”可以有效地降低庫倫排斥能，從而出現一種獨特類型的金屬，稱為罕得金屬。在本論文中，我們首先介紹在研究中所使用的實驗技術，包括X光繞射、吸收和共振非彈性軟X光散射（RIXS）。我們討論YMn6Sn6的X光吸收能譜 (XAS) 中的自我吸收效應，並使用“多重計算(multiplet calculations)”來解釋軟X光光譜。我們使用跨越 Mn L3 邊緣的各種入射光子能量對YMn6Sn6進行 RIXS 量測；獲得的數據揭示了兩種不同的RIXS能譜特徵：類螢光和類拉曼 RIXS 特徵。類螢光特徵反映了穿過費米能階的 3d 能帶間的躍遷，而類拉曼特徵源自 Mn 的d電子和d電子激發。此雙重 RIXS 特性與亞錳酸鹽金屬行為的雙交換模型相似。此外，我們預計自能的理論計算將能解釋三個 Mn 3d 能帶是金屬性的，而另外兩個是絕緣的。這些結果證實 YMn6Sn6 是具有軌道選擇性的罕德金屬。
The strong electronic correlations play an important role in many transition-metal oxides. Due to the significant Coulomb repulsion and reduced bandwidth, electrons become localized, resulting in the material exhibiting Mott insulating properties. However, in multiorbital materials, the intra-atomic exchange interaction of spins can effectively reduce the repulsive Coulomb energy, leading to the emergence of a distinct type of metal known as Hund’s metal. In this thesis, we first introduce the experimental techniques used in the studies, including X-ray diffraction, absorption, and resonant inelastic soft X-ray scattering (RIXS). We studied the self-absorption effect in X-ray absorption spectroscopy (XAS) of YMn6Sn6 and used multiplet calculations to explain the spectra. We performed RIXS measurements on YMn6Sn6 using various incident photon energies across the Mn L3 edge; the obtained data revealed two distinct RIXS spectral signatures: fluorescence-like and Raman-like RIXS features. The fluorescence-like signature reflects the transitions of the 3d bands crossing the Fermi level, while the Raman-like signature originates from Mn dd excitations. Our observation of dual RIXS characteristics is analogous to the double-exchange model that explains the metallic behavior of manganites. Additionally, we anticipate that theoretical calculations of self-energy will show that three of the Mn 3d bands are metallic, while the other two are insulating-like. These results provide spectral evidence for the existence of orbital-selective Hund’s metal in YMn6Sn6.
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