Author(s) Anne-Marie Jeffery, Randolph E. Elmquist, John Q. Shields, Lai H. Lee, Marvin E. Cage, Scott … 4 K. von Klitzing S´eminaire Poincar´e with high precision by the equation ρxy = h/ie2 (h=Planck constant, e=elementary charge and i the number of fully occupied Landau levels). Js. In 1980, Klaus von Klitzing discovered the quantum Hall effect in an interface between a metal and a semiconductor in a very clean material. The Quantum Hall effect article has R K = h/e 2.And "On 16 November 2018, the conventional value was abrogated in consequence of the decision to fix the values of h (the Planck constant… When I look up the von Klitzing constant at CODATA I see "Numerical value 25 812.807 45...". Because of its extraordinarily high precision, R K is employed around the world as a standard of electrical resistance. In this effect, changes in the magnetic field result in changes in what is known as Hall conductance that vary in steps of whole-number multiples of a constant. (3) This is called “one von Klitzing” constant because it was first measured by von Klitzing, Dorda and Pepper [1]. conventional value of Josephson constant: 483 597.9 e9 (exact) Hz V^-1: conventional value of von Klitzing constant: 25 812.807 (exact) ohm: Cu x unit: 1.002 076 97 e-13: 0.000 000 28 e-13: m: deuteron-electron mag. Although von Klitzing’s investigations with the Hall effect only suggested conductance values that were multiples of integers, in 1982 a research group working at Bell Labs discovered … Published. The von Klitzing constant R K describes the way electrical resistance exists in discrete, quantized values (instead of continuous ones) in certain kinds of physical systems. This site uses cookies to give you the best, most relevant experience. (2) It is a matter of a pencil calculation to show that, h / e. 2 = 258 12.807 5651 Ohm. By continuing to browse the site you are agreeing to our use of cookies. There are more digits in the "...". SAVE THE VON KLITZING CONSTANT ! The Von Klitzing constant, which looks like this: RK = h / e2 = 25812.807449(86)Ω, was named in honor of Klaus Von Klitzing's (born 1943) discovery of the Quantum Hall Effect. Determination of the Von Klitzing Constant and the Fine-Structure Constant Through a Comparison of the Quantized Hall Resistance and the Ohm Derived from the NIST Calculable Capacitor. June 1, 1998. conventional value of von Klitzing constant: Numerical value: 25 812.807 : Standard uncertainty (exact) Relative standard uncertainty (exact) Concise form 25 812.807 Click here for correlation coefficient of this constant with other constants 2 . mom. The constant has been listed on the National Institute of Standards and Technology Reference on Constants, Units, and Uncertainty. This is an exact value found from other fundamental constants as you know. ratio-4.664 345 537 e-4: 0.000 000 039 e-4: deuteron-electron mass ratio: 3670.482 9652: … In … Also it became clear, that the component ρxy of the resistivity tensor can be measured directly with a volt- and amperemeter (a fact overlooked by The von Klitzing constant, which has become a new standard unit for electrical resistance, was established from this expression. The Planck’s constant is associated with the frequency or the wave length of a particle, h =6.626 068 96(33) ×10-34 . Since h/e. and 2e/h are the only “fundamental constants” which can be measured with such a high precision, that conventional values were introduced for metrological applications, one may think to fix these numbers instead of fixing e and h which are not directly accessible by … , was established from this expression K is employed around the world a! Are agreeing to our use of cookies 45... '' from this.! 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