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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

Aharonov-Casher Effect

Experimental Method

making the specimen

Making the Specimen

Yttrium Barium Copper Oxide

(YBa2Cu3O7-)

making the specimen1
Making the Specimen
  • Crushing old YBCO specimens
making the specimen2
Making the Specimen
  • Crushing old YBCO specimens
  • Filling die with YBCO powder
  • Add ethanol
  • Compress in vice
making the specimen3
Making the Specimen
  • Crushing old YBCO specimens
  • Filling die with YBCO powder
  • Add ethanol
  • Compress in vice
  • Sinter
making the specimen4
Making the Specimen
  • Crushing old YBCO specimens
  • Filling die with YBCO powder
  • Add ethanol
  • Compress in vice
  • Sinter
  • Cut & Polish Specimen
experiments

Experiments

Testing Superconductivity

(AC Resistivity)

experimental setup
Experimental Setup

Helium Fridge

Specimen “Cold Finger”

experimental setup1
Experimental Setup

Ammeter

Function

Generator

Computer

Cathode Ray

Oscilloscope

Voltage

Source

Selectable

Resistor

(1kΩ)

Lock-in Amplifier

testing circuit diagram
Testing Circuit Diagram

ACVoltage

Lock-In Amp

Voltage

Sense

Meter

Current

Sense

Meter

Thermocouple

Specimen

experiments1

Experiments

Aharonov-Casher Effect

experimental setup3
Experimental Setup

Ramp

Generator

Ammeter

Computer

Cathode Ray

Oscilloscope

Voltage

Source

Selectable

Resistor

(1kΩ)

circuit diagram
Circuit Diagram

Voltage Ramp

& 1000µF Capacitor

LeCroy Oscilloscope

DC Voltage

& Resistor

“Cold Finger”

measuring the effect
Measuring The Effect
  • Charge “ramp” in centre
  • Causes frequency in V/A
  • Analysed by Fast Fourier Transform (FFT)
lecroy dual oscilloscope
LeCroy Dual-Oscilloscope

Real-time FFT

Difference between

Saved & average

Averaged FFT

Saved FFT

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