| Project/Area Number |
10640339
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
固体物性Ⅱ(磁性・金属・低温)
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
MATSUURA Tamifusa Nagoya University, Graduate School of Scinence,Professor, 大学院・理学研究科, 教授 (10022609)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
ONO Yoshiaki Nagoya University, Graduate School of Scinence, Associate, Professor, 大学院・理学研究科, 助教授 (40221832)
|
|---|
| Project Period (FY) |
1998 – 2001
|
| Project Status |
Completed (Fiscal Year 2001)
|
| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥1,200,000 (Direct Cost: ¥1,200,000)
|
|---|
| Keywords | Fermi Liquid / Non-Fermi Liquid / Critical Exponent / Slabe Boson / Pseudo-Fermion / Heavy Electron / 1 / N-Expansion / チャンネル / 磁性 / 超伝導 / 近藤効果 / ヘビーフェルミオン / スレーブボゾン / N-展開法 / N展開放 |
|---|
| Research Abstract |
Main purpose of this project is to study various anomalous properties in the system with multi-freedoms. These freedoms are due to magnetic dipoles, quadrupole and octapole. In this study, we investigate effects of these freedoms.
First, using 1/N expansion method in the impurity Anderson model, we determined the exponents of the infrared divergence of the slave boson and pseudo-fermion correctly. In the single channel case however the infrared divergent terms in the slave boson and pseudo-fermion cancelled out in the physical quantities completely and the system resulted in the Fermi liquid. In the multi-channel case the anomalous terms remain and system becomes non Fermi liquid. We determined the threshold exponents.
We also investigated the Anderson lattice with use of l/N : expansion method. In the single channel case the anomalous terms associated with pseudo-particles cancel out in the physical quantities and the system becomes Fermi liquid. In the multi-channel case, the resistivity has anomalous term proportional to temperature which suggests the non-Fermi liquid.
In the second we use the above 1/N-expansion method to study the high temperature superconductors. We invesitigate pseudo-gap and obtain the phase diagram with TO, Tsg and Tc advocated by Sato'group. The origin of the pseudo-gap is due to the interplay between the spin flucuations and superconducting fluctuations. We deriverd the phase diagram theoretically.
|
