2000 Fiscal Year Final Research Report Summary
INVESTIGATION ON NEW ORDERED PHASES OF FERMI AND BOSE PARTICLES UNDER COMPLEX ULTRA-CONDITIONS
| Project/Area Number |
09640436
|
|---|
| 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 | OKAYAMA UNIVERSITY |
|---|
Principal Investigator |
MACHIDA Kazushige OKAYAMA UNIVERSITY, GRADUATE SHOOL OF NATURAL SCIENCE, PROFESSOR, 大学院・自然科学研究科, 教授 (50025491)
|
|---|
| Project Period (FY) |
1997 – 2000
|
| Keywords | BOSE-EINSTEIN CONDENSATION / QUANTIZED VORTEX / SPIN TRIPLET SUPER CONDUCTOR / NON-UNITARY PAIR / ノンユニタリー状態 |
|---|
| Research Abstract |
Observation of the quantized vortex in Bose-Einstein condensation leads us to further consider this problem : In order to see the intrinsic instability of a vortex in BEC, while we claim to occur in this system, we propose several theories on vortex nucleation. The observed nuleation angular velocity is far from the estimate done by others based on the Thomas Fermi approximation, but our microscopic theory gives a reasonable value. Future study of this vortex nucleation problem may shed further light on this long-standing issue.
We also have investigated the coexistence problem between ferromagnetism and superconductivity, which is recently observed in a new heavy Fermion material : UGe2 under moderate pressure. Gigantic exchange internal field built in ferromagnetic phase in this material almost certainly excludes singlet pairing, leading to a non-unitary triplet pairing. We examine various exotic characteristics associated with the pairing state.
|
