| Project/Area Number |
09831001
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
極微細構造工学
|
|---|
| Research Institution | Utsunomiya University |
|---|
Principal Investigator |
OYA Ginichiro Utsunomiya Univ., Dept. of Energy and Environmental Science, Professor, 大学院・工学研究科, 教授 (00006280)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
IRIE Akinobu Utsunomiya Univ., Dept. of Electrical and Electronic Eng., Associate Professor, 工学部, 助教授 (90241843)
ISHII Kiyoshi Utsunomiya Univ., Dept. of Electrical and Electronic Eng., Associate Professor, 工学部, 助教授 (30134258)
|
|---|
| Project Period (FY) |
1997 – 1999
|
| Project Status |
Completed (Fiscal Year 1999)
|
| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
|
|---|
| Keywords | high-temperature superconductor / BiィイD22ィエD2SrィイD22ィエD2CaCuィイD22ィエD2OィイD2yィエD2 / single crystal / intrinsic Josephson junction / natural superlattice / flux quantum / vortex flow / high-frequency oscillation / 高温超伝導体 / 酸化物高温超伝導体 / 磁束フロー / フィスケ・ステップ / 超格子 / 磁束量子列 / 共振 |
|---|
| Research Abstract |
The purpose of this study is to establish the fundamentals of quantum effect devices using dynamic behavior of coherent waves of electrons (holes) and flux quanta in natural superlattices of intrinsic Josephson junctions, which consist of superconducting CuOィイD22ィエD2 and insulating BiO/SrO layers, in layered high-temperature oxide-superconductor BiィイD22ィエD2SrィイD22ィエD2CaCuィイD22ィエD2OィイD2yィエD2 single crystals.
The results obtained in this study are as follows :
1. For rectangular and annular mesas (superlattices) fabricated as basic shapes of the devices from the single crystals, it has been clarified that the coherent motion of flux quanta (Josephson vortices) introduced by applying magnetic fields to the mesas occurs at high rates of (1-5)×10ィイD1-6ィエD1m/s (at 4.2K) by biasing currents to the mesas, which correspond nearly to the highest phase velocity of electromagnetic waves induced in the constituent intrinsic Josephson junctions. Numerical simulations have also shown such a motion of flux quanta in the superlattices.
2. For rectangular mesas, it has been found that high frequency oscillations, which take place due to the motion of flux quanta in the intrinsic Josephson junctions, can be controlled by external magnetic fields, and as a result, a high frequency oscillation of 80GHz occurs with a magnetic field of 0.16T at 4.2K.
3. For rectangular and annular mesas, it has also been found that the coherent motion of electronic (hole) waves in the intrinsic Josephson junction superlattices can be excited and controlled as in switching devices by current pulses, and then high frequency oscillations of several ten GHz-THz (at 4.2K) can also occur.
|
