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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
高 Tc 材料中的瞬态光致电导率:光生载流子中的相分离成金属滴和光致超导
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

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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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