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Published byAusten Sullivan Modified over 9 years ago
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Quantum Design PPMS & Transport and Magnetic Measurements
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How to measure? Force : F = mass x acceleration [Newton’s Law] acceleration = change in velocity/time = v/ t = ( d/ t)/ t F = mass x gravity F= - k x displacement Torque = leverarm x Force In Collison : F = Change In Momentum/change in time
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Optical Measurements Focal Length of a Lens Interference :
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Magnetic Field Biot and Savart Law Calculating Magnetic field around a conductor carrying current Ampere’s theorem can also be applied Magnetic field due to a solenoid B n I B I
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Superconductor Resistance 0 Oppose the applied magnetic field Current is due to pair of electron
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Josephson Junction Superconductor 1 Superconductor 2 I = I 0 Sin Quantum flux = h/2e = 2.067 x 10 -15 Wb Insulator
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SQUID Magnetic field of Heart 10 -10 T SQUID devices were used ( Sperconducting Quantum Interference Devices) It can measure the magnetic field less than 10 -14 T
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PPMS or MPMS Use SQUID principle to set up magnetic field ( higher accuracy)
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PPMS or MPMS Use SQUID principle to set up magnetic field ( higher accuracy) PPMS with VSM VSM : Vibrating Sample Magnetometer
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What can be measured 1.Resistacne vs H 2.Resistance Vs Temperature from 0.3K to 450 K // & 3.I-V as a function of H, // & 4.Ac transport 5.Hall effect 6.Differential resistance 7.Specific heat capacity 8.Angular variation 9. Thermal transport Magnetic : 1.Magnetic hysteresis 2.Susceptibility 3.Torque 4.Magnetic field H, // & 5.Ultra low field option < 0.1 G
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PPMS inside view
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Sample Puck Current Voltage
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VSM Option Direction of current depends on the motion of magnet Induced Emf = - (Flux)/ t N
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VSM contd. VSM coil Motor Oven stick 300- 1000K
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Thank You Questions?
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