2012 Fiscal Year Final Research Report
Spectroscopic studies on novel electronic phase due to large amplitude atomic oscillations
| Project Area | Emergence of Heavy Electrons and Their Ordering |
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| Project/Area Number |
20102005
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Kobe University |
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Principal Investigator |
TOU Hideki 神戸大学, 大学院・理学研究科, 教授 (60295467)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Takashi 広島大学, 大学院・先端物質科学研究科, 教授 (00192617)
UDAGAWA Masayuki 広島大学, 大学院・総合科学研究科, 教授 (70144889)
IWASA Kazuaki 東北大学, 理学研究科, 准教授 (00275009)
LEE Chul-ho 独立行政法人産業技術総合研究所, エネルギー技術研究部門, 主任研究員 (80358358)
TSUTSUI Satoshi (財)高輝度光科学研究センター, 利用研究促進部門非弾性散乱チーム, 副主幹研究員 (70360823)
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| Co-Investigator(Renkei-kenkyūsha) |
NEMOTO Yuichi 新潟大学, 自然科学系, 准教授 (10303174)
ALFRED Baron 独立行政法人理化学研究所, バロン物質ダイナミクス研究室, 准主任研究員 (90442920)
URUGA Tomoya (財)高輝度光科学研究センター, 利用研究促進部門 分光物性I グループ, 副主席研究員 (70241255)
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| Project Period (FY) |
2008 – 2012
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| Keywords | ラットリング / 重い電子系化合物 / 電子・格子相互作用 / 磁性 / 超伝導 |
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| Research Abstract |
NMR, ultrasonic, Raman scattering, X-ray scattering, and inelastic neutron scattering experiments were carried out to clarify the properties of the ground state in caged compounds. (1) The rattling motions of guest atoms in type -I clathrates correspond to the characteristic temperature scale of 20-30 K, and strongly interact with conduction electron states. Significant electron-local phonon coupling leads to enhancement of various physical quantities. (2) The heavy fermion behavior in ROs4Sb12 is attributed to the correlation between the conduction electrons and the lowest energy excitation, either rattling state or crystal electric field (CEF) state. (3) The primary order parameter of SmRu_4P_<12> is found to be an octupole T^α, or T^β. (4) Phonon anomalies in GdB_6 and DyB_6 are expected to be caused by strong electron-phonon interaction. (5) The structural phase transition observed in RT_2Xn_<20> is attributed to rattling transition due to the strong electro-phonon coupling. In PrIr_2Zn_<20>, the rattling transition is suppressed and the antiferroquadrupolar ordering occurs at T_Q.
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