2011 Fiscal Year Final Research Report
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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| Keywords | 高温超伝導 |
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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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