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Aharonov-Casher Effect

Aharonov-Casher Effect. Experimental Method. Making the Specimen. Yttrium Barium Copper Oxide (YBa 2 Cu 3 O 7-  ). Making the Specimen. Crushing old YBCO specimens. Making the Specimen. Crushing old YBCO specimens Filling die with YBCO powder Add ethanol Compress in vice.

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Aharonov-Casher Effect

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  1. Aharonov-Casher Effect Experimental Method

  2. Making the Specimen Yttrium Barium Copper Oxide (YBa2Cu3O7-)

  3. Making the Specimen • Crushing old YBCO specimens

  4. Making the Specimen • Crushing old YBCO specimens • Filling die with YBCO powder • Add ethanol • Compress in vice

  5. Making the Specimen • Crushing old YBCO specimens • Filling die with YBCO powder • Add ethanol • Compress in vice • Sinter

  6. Making the Specimen • Crushing old YBCO specimens • Filling die with YBCO powder • Add ethanol • Compress in vice • Sinter • Cut & Polish Specimen

  7. Finished Specimen

  8. Experiments Testing Superconductivity (AC Resistivity)

  9. Experimental Setup Helium Fridge Specimen “Cold Finger”

  10. Experimental Setup Ammeter Function Generator Computer Cathode Ray Oscilloscope Voltage Source Selectable Resistor (1kΩ) Lock-in Amplifier

  11. Testing Circuit Diagram ACVoltage Lock-In Amp Voltage Sense Meter Current Sense Meter Thermocouple Specimen

  12. Results

  13. Experiments Aharonov-Casher Effect

  14. Experimental Setup

  15. Experimental Setup Ramp Generator Ammeter Computer Cathode Ray Oscilloscope Voltage Source Selectable Resistor (1kΩ)

  16. Circuit Diagram Voltage Ramp & 1000µF Capacitor LeCroy Oscilloscope DC Voltage & Resistor “Cold Finger”

  17. Measuring The Effect • Charge “ramp” in centre • Causes frequency in V/A • Analysed by Fast Fourier Transform (FFT)

  18. Measuring The Effect

  19. LeCroy Dual-Oscilloscope Real-time FFT Difference between Saved & average Averaged FFT Saved FFT

  20. Possible Solutions • Noise-free environment • More accurate voltage ramp • Use thin film sample • Better capacitance calculation

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