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We report ultra-low temperature experiments on the obscure fractional quantumHall effect (FQHE) at Landau level filling factor $\nu$=5/2 in a very highmobility specimen of $\mu=1.7 \times 10^7$ cm$^2$/Vs. We achieve an electrontemperature as low as $\sim$ 4~mK, where we observe vanishing $R_{xx}$ and, forthe first time, a quantized Hall resistance, $R_{xy}=h/(5/2e^2)$ to within 2ppm. $R_{xy}$ at the neighboring odd-denominator states $\nu$=7/3 and 8/3 isalso quantized. The temperature dependences of the $R_{xx}$-minima at thesefractional fillings yield activation energy gaps $\Delta_{5/2}$=0.11K,$\Delta_{7/3}$=0.10K, and $\Delta_{8/3}$=0.055K.Comment: 5 pages, 3 figure

physical review letters

Exact Quantization of the Even-Denominator Fractional Quantum Hall State at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">ν</mml:mi><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mn>5</mml:mn><mml:mn /><mml:mi>/</mml:mi><mml:mn>2</mml:mn></mml:math>Landau Level Filling Factor

Exact Quantization of the Even-Denominator Fractional Quantum Hall State atν=5/2Landau Level Filling Factor