Relation between charge order and Nernst effect
| Project/Area Number |
21740248
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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 | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 高温超伝導 / 銅酸化物高温超伝導体 / ネルンスト効果 / 電荷秩序 / ストライプ秩序 / 量子臨界点 / 圧力効果 / 圧力下ネルンスト測定 |
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| Research Abstract |
e have precisely measured the Nernst effect in Nd-doped La_<2-x> Sr_xCuO_4 single crystals with controlling the strength of the stripe order. We found that the onset temperature T_onset, where the Nernst signal starts increasing, does not change conspicuously in spite of Nd-doping. At low temperatures, on the other hand, the absolute value of the Nernst signal is strongly suppressed in accordance with the strength of the stripe order. These results imply that the fluctuation of(charge) stripe order enhances the Nernst signal below T_onset at high temperatures, and then the stripe order enhanced by Nd-doping suppresses the superconducting fluctuation to reduce the Nernst signal at low temperatures. We also observed an increase of the Nernst signal below the charge order temperature T_ch which is observed in diffraction measurement.
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Report
(4 results)
Research Products
(14 results)
