2010 Fiscal Year Final Research Report
Novel transport phenomena in spin-triplet superconductor
| Project/Area Number |
21740276
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | Shinshu University (2010)
National Institute of Advanced Industrial Science and Technology (2009) |
|---|
Principal Investigator |
KAMBARA Hiroshi Shinshu University, 教育学部, 助教 (00313198)
|
|---|
| Project Period (FY) |
2009 – 2010
|
| Keywords | 強相関系 / スピン3重項超伝導 / ルテニウム酸化物 |
|---|
| Research Abstract |
Using micro fabrication techniques, we investigated local transport characteristics of spin-triplet p-wave superconductor Sr_2RuO_4 (SRO). We observed novel phenomena such as, (i) an unconventional hysteresis in voltage-current characteristics in a few μm-width weak junction, and (ii) a large enhancement of superconducting critical current density with reducing cross section below 100m^2. These phenomena imply that edge states are formed in a microfabricated SRO device. We also studied tunnel spectra of an SRO break junction formed by microfabrication. The tunnel spectra showed broad zero-bias conductance peaks, which supports the chiral p-wave state in SRO.
|
