THE CHEMICAL CONTROL OF HIGH-T(C) SUPERCONDUCTIVITY - METAL-SUPERCONDUCTOR-INSULATOR TRANSITION IN (TL1-YPBY)SR2(CA1-XYX)CU2O7
| Autor: | Ru-Shi Liu, D. A. Jefferson, Y. T. Huang, M.-J. Tsai, P. P. Edwards, Shih-Kuo Wu, Shu Fen Hu |
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| Rok vydání: | 2016 |
| Předmět: |
Superconductivity
chemistry.chemical_classification Condensed matter physics chemistry.chemical_element Yttrium Condensed Matter Physics Acceptor Electronic Optical and Magnetic Materials Crystallography Superconductor Insulator Transition chemistry Mott Criterion Materials Chemistry Cuprate Condensed Matter::Strongly Correlated Electrons Electrical and Electronic Engineering Metal–insulator transition Inorganic compound |
| Popis: | The authors have carried out a detailed study of the relationship between the semiconducting, the superconducting, and the metallic region in the system (Tl{sub 0.5}Pb{sub 0.5})Sr{sub 2}(Ca{sub 1{minus}x}Y{sub x})Cu{sub 2}O{sub 7}. The critical density (or concentration), n{sub c}, derived from Hall measurement of the titled series compounds at which the transition from insulator to metal place can be given by the well-known Mott formula: n{sub c}{sup 1/3}a{sub H*}=0.26 where a{sub H*} is the effective Bohr orbit radius of the isolated donor or acceptor state wavefunction. The authors propose that the insulator-metal transition in the cuprates generally occurs at a very high hole density (n{sub c} {approximately}10{sup 20}-10{sup 21}cm{sup {minus}3}) as compared to conventional doped semiconductors (n{sub c} {approximately} 10{sup 17}-10{sup 18}cm{sub {minus}3}) but rather lower than the critical densities for elemental metals (n{sup c} > 10{sup 21}cm{sup {minus}3}). |
| Databáze: | OpenAIRE |
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