SUPERCONDUCTING QUANTUM INTERFERENCE DEVICE.pptx

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1. SQUID S UPERCONDUCTING QU ANTUM I NTERFERENCE D EVICE

2. CONTENTS S UPERCONDUCTIVITY MEISNER EFFECT APPLICATIONS OF SQUID BCS THEORY AND COOPER PAIR

3. SUPERCONDUCTIVITY Superconductivity was discovered in 1911 by K H Onnes He discovered it while trying to measure the residual resisitviy of Mercury at liquid Helium temperature (4.2K) He founded that below a certain temperature, the resistance becomes 0 Not only mercury but he found similar effects in many other materials and called them superconductors This allows to charges with perfect efficiency without energy loss with 0 resistance in the lattice

4. MEISNER EFFECT Another interesting discovery in superconductivity is Meisner Effect in 1933 When the Temperature is above the Critical temperature the Superconductor allows the Magnetic field to penetrate But When the Temperature is below the critcial temperature the Superconductor does not allows the Magnetic field to penetrate

5. BCS THEORY The first Microscopic Quantum theory of Superconductivity was given by Bardeen Cooper Schrieffer in 1957 This Theory explains that below the Critical temperature, the total resistance of Particular material becomes 0 The electron lattice interaction occured in this theory is explains that negative charge and negative charge bind together In simple process the like charges repels but here it will bind together and this type of binding is known as Cooper pair and due to phonon electron gets bind together

6. APPLICATIONS Magnetoencephalography (MEG): SQUIDs are used to measure the magnetic fields produced by neural activity in the brain, providing insights into brain function and aiding in the diagnosis of neurological conditions. Magnetocardiography (MCG): SQUIDs can measure the magnetic fields generated by the heart, helping in the diagnosis of cardiac conditions. Magnetic Property Measurements: SQUIDs are used in magnetometers to study the magnetic properties of materials with high precision. Superconductivity Research: SQUIDs help in investigating the properties of superconductors.

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