| Project/Area Number |
15340104
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Hokkaido University |
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Principal Investigator |
ODA Migaku Hokkaido Univ., Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (70204211)
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| Co-Investigator(Kenkyū-buntansha) |
MOMONO Naoki Hokkaido Univ., Graduate School of Science, Assistant, 大学院・理学研究科, 助手 (00261280)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥14,800,000 (Direct Cost: ¥14,800,000)
Fiscal Year 2005: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2004: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥9,500,000 (Direct Cost: ¥9,500,000)
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| Keywords | high-Tc cuprates / STM / STS / pseudogap / charge order / vortex core / 磁束線 / 磁場誘起反強磁性秩序 / 磁束状態 / 中性子散乱実験 / 磁束線格子 |
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| Research Abstract |
Recently, it has been reported in neutron scattering experiments on La214 high-Tc cuprate that an antiferromagnetic order is induced by the application of magnetic fields in the superconducting state and coexists with the superconductivity. In STM/STS experiments on Bi2212 high-Tc cuprate, it has also been reported that the electronic energy spectrum in vortex cores exhibits the so-called "pseudogap", which is a characteristic feature for the normal state above Tc. In addition, STM/STS experiments on Bi2212 suggested that an electronic charge order with a periodicity of 〜4a×4a develops around vortex cores ; the charge order will be related with the field-induced antiferromagnetic order. In this research project, we have studied the 〜4a×4a charge order by STM/STS on Bi2212, in order to obtain clues to the understanding of the field-induced antiferromagnetic order, the pseudogap and the superconducting mechanism.
1. There exist two kinds of Bi2212 samples which exhibit strong and weak 〜4a×4a charge orders in the pseudogap state.
2. The pseudogap size is more spatially-inhomogeneous in the Bi2212 sample which exhibits a stronger 〜4a×4a charge order.
The latter result seems to indicate that the electronic charge order in the pseudogap state will be dynamically fluctuated in itself ; when there exist a lot of scattering centers causing the spatial inhomogeneity of electronic states, they will act as pinning potentials for the dynamically-fluctuated charge order and make it static.
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