Types of superconductors, Physics

Assignment Help:

 

Type 1 and type 2 superconductors: For one group of SUPERCONDUCTOR in which below Hc is in the Meissner state, where it excludes all the magnetic flux from the interior of the sample. Above Hc it is in normal state, where the magnetic flux penetrates the sample as it would normally and the conductivity is finite. The superconductor of this group is called Type 1 superconductor or soft superconductor. They are usually pure specimens of some elements and the value of critical magnetic field for them is always too low to have any useful technical applications in coils for super conducting magnets. They are completely diamagnetic and give away their super conductivity at lower field strength. For other groups of superconductors, the transition does not occur sharply from the Meissner state to the normal state, but goes through an intermediate phase. The applied field is able to pierce through certain local regions of the sample. As the applied field is below than Hc1, the specimen is diamagnetic and hence the flux is completely excluded in this range of field, it is called critical field. At this flux begins to penetrate the specimen and the penetration increases until Hc2 is reached. At Hc2 the magnetization vanishes and the specimen becomes normal conductor, Hc2 is called upper critical field. Moreover, the magnetization of this group of superconductors vanishes gradually as the field is increased rather than suddenly as for the Type 1 superconductors. However they are completely superconductors for all fields below Hc2. The superconductors of this group are called Type 2 superconductors or hard superconductors. They tend to be alloys or transition metals with high values of electrical resistivity in the normal state.

INTERMEDIATE STATE: When the specimen becomes super conductor the flux is concentrated at the sides of the specimen the initiation of the transition from superconducting state to normal state may exists as a complex mixture of normal and superconducting regions called the Intermediate state. The intermediate state is considered completely equivalent to a mixture of the two states.

 


Related Discussions:- Types of superconductors

Cirucular force, If 3 particles of different mass located at different pos...

If 3 particles of different mass located at different positions: 1- 1kg position : (0,0) 2- 2kg position: (0,5) 3- 3kg position : (-1,0) If a force of 2 N at 45 degrees is applie

Determine the reluctance of the mild steel- electric flux, A mild steel rin...

A mild steel ring has a radius of 50mm and a cross-sectional area of 400mm 2 . A current of 0.5 A flows in a coil wound uniformly around the ring and the flux formed is 0.1mWb

Why magnetic poles are reversed at a given position, Why magnetic poles are...

Why magnetic poles are reversed at a given position on a deflection magnetometer to take readings? The magnetic moment of the magnet is 30 A-m 2 . Its length 10cm. What is its

Determine the north pole of a compass needle, The magnetic field of Earth r...

The magnetic field of Earth resembles the field of a bar magnet. The north pole of a compass needle, used for navigation, generally points toward the geographic north pole.

Displacement of a small distance, how to use instruments like Vernier calip...

how to use instruments like Vernier calipers and micro screw gauge to measure round objects

Factor, Discuss the Factor affecting limiting current.

Discuss the Factor affecting limiting current.

Define optic axis of a crystal, Q. Define: optic axis of a crystal. In...

Q. Define: optic axis of a crystal. In a double refracting crystal there is a particular direction in which both the rays travel with same velocity. This direction is called a

Explain the wave particle duality, Explain the Wave Particle Duality An...

Explain the Wave Particle Duality Any object in the world can be considered to be a particle or wave and will exhibit properties of both. For example, a photon of light, an ele

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd