2005 Fiscal Year Final Research Report Summary
STM/STS studies on vortex-lattice and antiferromagnetism under high magnetic fields in high-Tc cuprates
| 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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| Keywords | high-Tc cuprates / STM / STS / pseudogap / charge order / vortex core |
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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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Research Products
(40 results)
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[Journal Article] μSR measurements on the vortex lattice of La_<1.83>Sr_<0.17>CuO_42006
Author(s)
A.J.Drew, D.O.G.Heron, U.K.Divakar, S.L.Lee, R.Gilardi, J.Mesot, F.Y.Ogrin, D.Charalambous, N.Momono, M.Oda, C.Baines
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Journal Title
Physica B 374-375
Pages: 203
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Direct observation of the flux-line vortex glass phase in a type-II superconductor2004
Author(s)
U.K.Divakar, A.J.Drew, S.L.Lee, R.Gilardi, J.Mesot, F.Y.Ogrin, D.Charalambous, E.M.Forgan, G..I.Menon, N.Momono, M.Oda, C.Dewhurst
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Journal Title
Physical Review Letters 92
Pages: 237004
Description
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[Journal Article] Local Electronic States in Bi_2Sr_2CaCu_2O_<8+δ>
Author(s)
A.Hashimoto, Y.Kobatake, Y.Ichikawa, S.Sugita, N.Momono, M.Oda, M.Ido
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Journal Title
Proceedings of the 1^<st> International Symposium on Topological Science and Technology "Topology in Ordered Phases (TOP2005)" (World Scientific) (in press)
Description
「研究成果報告書概要(欧文)」より
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