Aharonov-Casher Effect Experimental Method. Making the Specimen Yttrium Barium Copper Oxide (YBa 2 Cu 3 O 7-  )

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Presentation transcript:

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 Crushing old YBCO specimens

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

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

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

Finished Specimen

Experiments Testing Superconductivity (AC Resistivity)

Experimental Setup Helium Fridge Specimen “Cold Finger”

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

Testing Circuit Diagram Specimen Lock-In Amp AC Voltage VoltageSenseMeter CurrentSenseMeter Thermocouple

Results

Experiments Aharonov-Casher Effect

Experimental Setup

Selectable Resistor (1kΩ) Cathode Ray Oscilloscope Ammeter Voltage Source Computer Ramp Generator

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

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

Measuring The Effect

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

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