Temperature Dependence of the Hall and Longitudinal Resistances in a Quantum Hall Resistance Standard.
We present detailed measurements of the temperature dependence of the Hall and longitudinal resistances on a quantum Hall device [(GaAs(7)] which has been used as a resistance standard at NIST. We find a simple power law relationship between the change in Hall resistance and the longitudinal resistance as the temperature is varied between 1.4 K and 36 K. This power law holds over seven orders of magnitude change in the Hall resistance. We fit the temperature dependence above about 4 K to thermal activation, and extract the energy gap and the effective g-factor.
University of Maryland, College Park, MD 20742.
J
J
Matthews
National Institute of Standards and Technology, Gaithersburg, MD 20899-8172.
M E
ME
Cage
quantum Hall effect; resistance standard; temperature dependence