期刊
PHYSICAL REVIEW LETTERS
卷 98, 期 3, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.98.036401
关键词
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The metal-insulator transition (MIT) has been studied in Ba0.9Nd0.1CuO2+x/CaCuO2 ultrathin cuprate structures. Such structures allow for the direct measurement of the 2D sheet resistance R-square, eliminating ambiguity in the definition of the effective thickness of the conducting layer in high temperature superconductors. The MIT occurs at room temperature for experimental values of R-square close to the 25.8 k Omega universal quantum resistance. All data confirm the assumption that each CaCuO2 layer forms a 2D superconducting sheet within the superconducting block, which can be described as weak-coupled equivalent sheets in parallel.
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