There are more digits in the "...". Published. The von Klitzing constant, which has become a new standard unit for electrical resistance, was established from this expression. The constant has been listed on the National Institute of Standards and Technology Reference on Constants, Units, and Uncertainty. Author(s) Anne-Marie Jeffery, Randolph E. Elmquist, John Q. Shields, Lai H. Lee, Marvin E. Cage, Scott â¦ 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. SAVE THE VON KLITZING CONSTANT ! This site uses cookies to give you the best, most relevant experience. Js. This is an exact value found from other fundamental constants as you know. 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. mom. 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. (2) It is a matter of a pencil calculation to show that, h / e. 2 = 258 12.807 5651 Ohm. 2 . Because of its extraordinarily high precision, R K is employed around the world as a standard of electrical resistance. and 2e/h are the only âfundamental constantsâ 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 â¦ The Planckâs constant is associated with the frequency or the wave length of a particle, h =6.626 068 96(33) ×10-34 . ratio-4.664 345 537 e-4: 0.000 000 039 e-4: deuteron-electron mass ratio: 3670.482 9652: â¦ Although von Klitzingâs investigations with the Hall effect only suggested conductance values that were multiples of integers, in 1982 a research group working at Bell Labs discovered â¦ (3) This is called âone von Klitzingâ constant because it was first measured by von Klitzing, Dorda and Pepper [1]. Since h/e. 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. In 1980, Klaus von Klitzing discovered the quantum Hall effect in an interface between a metal and a semiconductor in a very clean material. 4 K. von Klitzing S´eminaire Poincar´e with high precision by the equation Ïxy = h/ie2 (h=Planck constant, e=elementary charge and i the number of fully occupied Landau levels). By continuing to browse the site you are agreeing to our use of cookies. Also it became clear, that the component Ïxy of the resistivity tensor can be measured directly with a volt- and amperemeter (a fact overlooked by When I look up the von Klitzing constant at CODATA I see "Numerical value 25 812.807 45...". The Von Klitzing constant, which looks like this: RK = h / e2 = 25812.807449(86)Î©, was named in honor of Klaus Von Klitzing's (born 1943) discovery of the Quantum Hall Effect. 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 constantâ¦ 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 June 1, 1998. In â¦ , Units, and Uncertainty 5651 Ohm of cookies of electrical resistance an exact found... Units, and Uncertainty ) ×10-34 von Klitzing constant, which has a. Of a particle, h / e. 2 = 258 12.807 5651 Ohm standard of electrical resistance particle... 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