Physics Lab Equipment

LEAI-73 Apparatus of Measuring Superconducting Critical Temperature

LEAI-73 Apparatus of Measuring Superconducting Critical Temperature


  • 4-lead method has high measuremnt accuracy

  • Both manual recording and software acquisition data

  • Industrial sample can be stored in room temperature & durable

  • Sample has large current range


The superconducting phenomenon was discovered by Dutch physicist Heike Kamerlingh Onnes in 1911. After the successful development of strong magnetic materials and the discovery of the Josephson effect, especially with the discovery of new high critical temperature superconductors of the YBCO (YBa2Cu3O7) series and the BSCCO (Bi2Sr2Ca2Cu3O10) series, superconductivity theory and technology have developed rapidly in practical applications. Superconductive materials are now used in high-energy physics, electrical engineering, electronics, biomagnetics, aerospace, medical diagnostics and other fields. 

LEAI-73 Apparatus of Measuring High Temperature Superconducting Critical Temperature is a specially designed experimental equipment for measuring the basic characteristics of superconductors. It has features: 

1. The R-T relationship is measured at a certain current using the four-lead method. The critical temperature is determined based on either manual recording or software automatic acquisition. 

2. The sample has a large current range, which enables to measure the characteristic curve of temperature increasing or decreasing at different currents and analyze the error caused by the dynamic temperature difference. 

3. An industrial BSCCO wire material is used as the experimental sample, which is easy to store at room temperature and will not hydrolysis, so it is durable. 

The LEAI-73 apparatus consists of an electric control unit, a low-temperature liquid nitrogen Dewar and an experimental probe bar, on which the sample is wound on. The objectives of conducting experiments using this system are following:

1. Learn liquid nitrogen cryogenic technology; 

2. Measure the critical temperature of a BSCCO wire material and master the measurement method of resistance-temperature relationship; 

3. Understand the basic properties of superconductors and master the basic methods for determining superconductor states.

The instruction manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.



Experimental Sample

BSCCO wire

Sample Current

0 ~ 110 mA (continuously adjustable)

Measurement of Sample Resistance

resolution 0.1 milli-Ohm
Operating Temperature77 K ~ 300 K

Thermometer Current

1 mA
Temperature Measurementresolution 0.1 K

Liquid Nitrogen Container

volume 3 liters, caliber 50 mm
Experimental Probe Barlength 62 cm
Power Consumption20 W

Part List

Main electric unit1
Liquid nitrogen dewar1
Experimental probe
Superconductor sample1 (wound on probe bar)
7-core cable
Serial data cable1
USB to RS232 converting cable
Power cord
Instruction manual (CD)1


Sample of acquired data


Photo of the experimental probe

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