| Project/Area Number |
22740230
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2011
|
| Project Status |
Completed (Fiscal Year 2011)
|
| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | 高温超伝導 / 銅酸化物高温超伝導体 / スピン揺らぎ / 磁性同位体効果 / 中性子散乱 / 酸化物高温超伝導体 / レゾナンスピーク / 磁性不純物Ni置換 |
|---|
| Research Abstract |
In order to reveal microscopic mechanism of the formation of Cooper pairs in high transition temperature (T_c) superconducting cuprates, we have investigated Ni-doping effect on spin dynamics by inelastic neutrons scattering. We have found that the waist energy of the hourglass shaped dispersion, E_<cross>. shift to lower energies with holding linear relationship to T_c, which is analogous to the isotope effect in BCS-type superconductors. Our findings indicate that antiferromagnetic spin fluctuations near E_<cross> play an important role on the formation of Cooper pairs in high-T_c cuprates.
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