Peak Values of Conductivity in Integer and Fractional Quantum Hall Effect

Abstract

The diagonal conductivity ${\sigma }_{xx}$ was measured in the Corbino geometry in both integer and fractional quantum Hall effect (QHE). We find that peak values of ${\sigma }_{xx}$ are approximately equal for transitions in a wide range of integer filling factors $3<\nu <16$, as expected in scaling theories of QHE. This fact allows us to compare peak values in the integer and fractional regimes within the framework of the law of corresponding states.

8 pages (revtex format), 3 postscript figures

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