2009 Fiscal Year Final Research Report
Novel Magnetism and Superconductivity on Filled Skutterudite Compounds which Possess Rattling
| Project/Area Number |
20740192
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | Hokkaido University |
|---|
Principal Investigator |
YANAGISAWA Tatsuya Hokkaido University, 創成研究機構, 特任助教 (10456353)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
GOTO Terutaka 新潟大学, 大学院・自然科学研究科, 教授 (60134053)
TAKEDA Naoya 新潟大学, 工学部, 教授 (80242171)
NEMOTO Yuichi 新潟大学, 大学院・自然科学研究科, 准教授 (10303174)
|
|---|
| Research Collaborator |
MAPLE M. Brian カリフォルニア大学サンディエゴ校, 物理学科, 教授
E. BAUMBACH Ryan カリフォルニア大学サンディエゴ校, 物理学科, 博士研究員
HO Pei-Chun カリフォルニア州立大学フレズノ校, 物理学科, 准教授
|
|---|
| Project Period (FY) |
2008 – 2009
|
| Keywords | 強相関系 / ラットリング / 超音波 / 充填スクッテルダイト / カゴ状化合物 |
|---|
| Research Abstract |
Ultrasonic measurements on the Filled-Skutterudite compounds Pr_<1-x>NdxOs_4Sb_<12>(x=0.45, 0.25, 1.0)have been performed. Frequency dependences of elastic constant C11 were investigated with longitudinal ultrasonic frequencies varying between 34 to 245 MHz on these samples. A characteristic ultrasonic dispersion, which had also been observed in PrOs_4Sb_<12> (x=0) at around 30K, is also observed in the dilute systems and shifts gradually to higher temperature with increasing the Nd concentration x. On the other hand, the C11 of x=0.45 sample shows softening and levels off feature at T=0.25K. This result implies that the Nd3+ ion's degenerate CEF ground state is split due to some order even in the Pr^<3+> ion's contribution to SC. In addition, a magnetically robust elastic softening of C11 was found in the end material NdOs_4Sb_<12> (x=1.0) under magnetic field 2 T<H<10T at low temperature T<1K, which suggest a presence of the off-center tunneling as same as LaOs_4Sb_<12> and PrOs_4Sb_<12>. Above results imply that an origin of the heavy-fermion state of NdOs_4Sb_<12> could possibly be related to a degenerate quantum ground state due to the off-center degrees of freedom.
|
Research Products
(12 results)
-
-
[Journal Article] Ultrasonic investigation of off-center rattling in Pr0. 55Nd0. 45Os4Sb122009
Author(s)
Tatsuya Yanagisawa, Taichi Mayama, Hiroyuki Hidaka, Hiroshi Amitsuka, Akio Yamguchi, Koji Araki, Yuichi Nemoto, Terutaka Goto, Naoya Takeda, Pei-Chun Ho, M. Brian Maple
-
Journal Title
Physica B 404
Pages: 3235-3237
Peer Reviewed
-
[Journal Article] Quadrupole Ordering in Clathrate Compound Ce3Pd20Si62009
Author(s)
Terutaka Goto, Tomoyuki Watanabe, Seiji Tsuduku, Haruki Kobayashi, Yuichi Nemoto, Tatsuya Yanagisawa, Mitsuhiro Akatsu, Genki Ano, Osamu Suzuki, Naoya Takeda, Andreas Donni, Hideaki Kitazawa
-
Journal Title
J. Phys. Soc. Jpn. 78
Pages: 024716(1-9)
Peer Reviewed
-
-
-
-
-
-
-
-
-
