El efecto fue descubierto en por HEINRICH HERTZ y explicado por ver efecto JOSEPHSON efecto Magnus ver efecto MAGNUS efecto mariposa ver. Observan por primera vez el efecto Josephson en un fluido ultrafrío – Download as PDF File .pdf) or read online. Brian David Josephson Category:Josephson effect eswiki Efecto Josephson; fiwiki Josephsonin ilmiö; frwiki Effet Josephson; gawiki Cumar Josephson.
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The Josephson effect is the phenomenon of supercurrenta current that flows indefinitely long without any voltage applied, across a device known as a Josephson junction JJwhich consists of two or more superconductors coupled by a weak link [ clarification needed ].
The weak link can consist of a thin insulating barrier known as a superconductor—insulator—superconductor junctionor S-I-Sa short section of non-superconducting metal S-N-Sor a physical constriction efevto weakens the superconductivity at the point efcto contact S-s-S.
The Josephson effect is an example of a macroscopic quantum phenomenon. It is named after the British physicist Brian David Josephsonwho predicted in the mathematical relationships for the current and voltage across the weak link.
The first paper to claim the discovery of Josephson’s effect, and to make the requisite experimental checks, was that of Philip Anderson and John Rowell. Before Josephson’s prediction, it was only known that normal i.
Josephson was the first to predict the tunneling of superconducting Cooper pairs. For this work, Josephson received the Nobel Prize in Physics in Types of Josephson junction include the pi Josephson junctionvarphi Josephson junctionlong Josephson junctionand Superconducting tunnel junction.
Josephson effect – Wikipedia
A “Dayem bridge” is a thin-film effcto of the Josephson junction in which the weak link consists of a superconducting wire with dimensions on the scale of a few micrometres or less. The Josephson effect has found wide usage, for example in the following areas:. The basic equations governing the dynamics of the Josephson effect are .
The critical current is an important phenomenological parameter of the device that can be affected by temperature as well as by an applied magnetic field. The DC Josephson effect is a direct current crossing the insulator in the absence of any external electromagnetic field, owing to tunneling.
Hence, for distinct AC voltages, the junction may carry a DC current and the junction acts like a perfect frequency-to-voltage converter.
The Josephson phase is the difference of the phases of the quantum mechanical wave function in two superconducting electrodes forming a Josephson junction. The Josephson energy is josepuson potential energy accumulated in a Josephson junction when a supercurrent flows through it. One can think of a Josephson junction as a non-linear inductance which accumulates magnetic field energy when a current passes through it.
In contrast to real inductance, no magnetic field is created by a supercurrent in a Josephson junction — the accumulated energy is the Josephson energy.
The work done on the junction so the junction energy is increased by. Note, that although Josephson junction behaves like an inductance, there is no associated magnetic field. The corresponding energy is hidden inside the junction. The Josephson Inductance is also known as a Kinetic Inductance — the behaviour is derived from the kinetic energy of the josphson carriers, not energy in a jodephson field.
By finding the derivative of the current with respect to time, and rearranging in the form of the inductance equation, inductance can be found. The Josephson penetration depth characterizes the typical length on which an externally applied magnetic field penetrates into the long Josephson junction.
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A Technical Report — Part 3: SI base units, section 2. BIPM[last updated: Physics and Applications of the Josephson Effect. Physica Status Solidi B.
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