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Making the SpecimenMaking the Specimen
Yttrium Barium Copper OxideYttrium Barium Copper Oxide
(YBa(YBa22CuCu33OO7-7-))
Making the SpecimenMaking the Specimen
Crushing old YBCO Crushing old YBCO specimensspecimens
Filling die with Filling die with YBCO powderYBCO powder
Add ethanolAdd ethanol Compress in viceCompress in vice
Making the SpecimenMaking the Specimen
Crushing old YBCO Crushing old YBCO specimensspecimens
Filling die with Filling die with YBCO powderYBCO powder
Add ethanolAdd ethanol Compress in viceCompress in vice SinterSinter
Making the SpecimenMaking the Specimen
Crushing old YBCO Crushing old YBCO specimensspecimens
Filling die with Filling die with YBCO powderYBCO powder
Add ethanolAdd ethanol Compress in viceCompress in vice SinterSinter Cut & Polish Cut & Polish
SpecimenSpecimen
ExperimentsExperiments
Testing SuperconductivityTesting Superconductivity
(AC Resistivity)(AC Resistivity)
Experimental SetupExperimental Setup
SelectableResistor
(1kΩ)
Cathode RayOscilloscope
Ammeter
Lock-in Amplifier
FunctionGenerator
VoltageSource
Computer
Testing Circuit DiagramTesting Circuit Diagram
SpecimenSpecimen
Lock-In AmpLock-In Amp
ACAC VoltageVoltage
VoltageVoltageSenseSenseMeterMeter CurrentCurrent
SenseSenseMeterMeter
ThermocoupleThermocouple
Experimental SetupExperimental Setup
SelectableResistor
(1kΩ)
Cathode RayOscilloscope
Ammeter
VoltageSource
Computer
RampGenerator
Circuit DiagramCircuit DiagramVoltage RampVoltage Ramp
& 1000& 1000µF CapacitorµF Capacitor
DC VoltageDC Voltage& Resistor& Resistor
LeCroy OscilloscopeLeCroy Oscilloscope
““Cold Finger”Cold Finger”
Measuring The EffectMeasuring The Effect
Charge “ramp” in Charge “ramp” in centrecentre
Causes frequency Causes frequency in V/Ain V/A
Analysed by Fast Analysed by Fast Fourier Transform Fourier Transform (FFT)(FFT)
LeCroy Dual-OscilloscopeLeCroy Dual-Oscilloscope
Real-time FFT
Difference betweenSaved & average
Averaged FFT
Saved FFT