Transient Photo-induced Conductivity in High Tc Materials: Phase Separation in Photogenerated Carriers into Metallic Drops and Photo-Induced Superconductivity
Transient Photo-induced Conductivity in High Tc Materials: Phase Separation in Photogenerated Carriers into Metallic Drops and Photo-Induced Superconductivity
批准号:
9121946
负责人:
Alan Heeger
金额:
$0.0万
依托单位国家:
美国
项目类别:
Continuing grant
财政年份:
1992
资助国家:
美国
项目状态:
已结题
起止时间:
1992-07-01 至 1995-12-31
中文摘要
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英文摘要
Preliminary measurements of the conductivity in high Tc 1-2-3 type copper oxide crystals after a short pulse of intense visible radiation show the lifetime of the photo-excited state is enhanced by nearly three orders of magnitude. The goal is to test two hypotheses: (1) the excitation process causes phase separation of the photo-induced carriers into metallic regions or droplets and (2) a photo-induced high temperature superconducting state is present in these phase separated metallic regions. Steady state and fast transient spectroscopy will be undertaken on several high Tc materials using strip-line configurations as a function of temperature and magnetic field.
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Opportunities and Challenges in the Field of Semiconducting (conjugated) Polymers
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Conjugated Polymers in Solution and in the Solid State
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Photogenerated Polarons in High-Tc Superconducting Oxides: Infrared Excitation Spectroscopy and Transient Photoinduced Conductivity in Semiconducting Yttrium-Barium-Copper-Oxides
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Conducting Polymers as Macromolecular Systems: Comprehensive Studies in Solution, in the Melt, and in the Solid State
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Sub-Picosecond Electro-Optic Sampling Facility for Fast Transient Photoconductivity Studies of Materials from the Family of High Temperature Superconducting Oxides
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US-Belgium Cooperative Research: Development and Characterization of Conjugated Polymers
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Gels and Solutions of Soluble Conjugated Polymers
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Synthesis of New Organic Materials with Unusual Properties (Materials Research)
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Electron Spin Resonance Studies of Conducting Polymers: Charge Storage and Charge Transport in Non-Degenerate Ground State Polymers (Materials Research)
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Synthesis of Conducting Polymers and A New Graphite (Parquetite) (Materials Research)
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New Syntheses of Polyenes (Materials Research)
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国内基金
海外基金
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