An Observation of Quantized Series of Step or Clew Temperatures in Superconductive-Conjugate Photoconductivity of Cu2O
Abstract
Details of the temperature dependences of transient photoconductivity Q(T, λ) with that of Hall mobility μH(T) of photoexcited carriers in Cu2O at low power level of λex{=}570--735 nm have been reexamined over a wide temperature range between 4.2 and 300 K in order to clarify the natures of “supercondcutive-conjugate photoconductivity”. Selective optical excitation at low levels of λex{=}570--750 nm creates either a free electron and a positive hole or mainly free holes in Cu2O. By carefully analyzing these data, we have recognized for the first time a novel quantized series of “Step Temperatures TpS” in Q(T, λ) with “Clew Temperatures TpC”, in the photoexcited holes density np(T, λ) in Cu2O as T decreases. A series of the values of TpS or TpC is possibly ruled by a type of condensation of valence electrons and free photocarriers into new states mediated via surrounding intraband CT-excitons of Cu2O. Here, we propose a new concept of “the excitonic isomer shift of superconductive TsC”.
- Publication:
-
Journal of the Physical Society of Japan
- Pub Date:
- November 1991
- DOI:
- 10.1143/JPSJ.60.3633
- Bibcode:
- 1991JPSJ...60.3633M
- Keywords:
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- Carrier Mobility;
- Copper Oxides;
- Hall Effect;
- High Temperature Superconductors;
- Photoconductivity;
- Temperature Dependence;
- Cyclotron Resonance;
- Free Electrons;
- Holes (Electron Deficiencies);
- Solid-State Physics