2011 Fiscal Year Final Research Report
Dynamic quantum melting and novel insulating phase in superconducting vortex solid
| Project/Area Number |
21340096
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | Tokyo Institute of Technology |
|---|
Principal Investigator |
OKUMA Satoshi 東京工業大学, 大学院・理工学研究科, 准教授 (50194105)
|
|---|
| Project Period (FY) |
2009 – 2011
|
| Keywords | 超伝導 / 密度波 |
|---|
| Research Abstract |
We observe intrinsic melting of fast driven vortex lattice(i. e., dynamic melting) in a superconductor in the limit of zero pinning. With decreasing temperature T, the T dependence of a dynamic melting field B c, dyn(T) becomes very weak and B c, dyn(T) is significantly suppressed compared to a static melting field. This is the first observation of a dynamic quantum melting transition. Although novel insulating phases have not yet been found, related to this issue, it has been revealed that the lattice orientation of the flowing vortex lattice rotates as the velocity exceeds a certain critical value. From this result, it has been first demonstrated that a microscopic mechanism of a quasi-particle life time dominates a macroscopic behavior of vortex dynamics.
|
