Lab Equipment for Teaching Physics

Features

• 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

  
  

Introduction

The LEAI-73 Apparatus is designed for studying the superconducting phenomenon and measuring the critical temperature (Tc) of superconducting materials, such as high-temperature superconductors. Superconductivity, first discovered by Heike Kamerlingh Onnes in 1911, has since become a key area of research with applications in high-energy physics, electronics, medical diagnostics, biomagnetics, and aerospace. The discovery of high-critical-temperature superconductors, particularly in the YBCO (YBa₂Cu₃O₇) and BSCCO (Bi₂Sr₂Ca₂Cu₃O₁₀) series, has significantly advanced both theory and practical applications in the field.

The LEAI-73 system provides the means to precisely measure the critical temperature of superconducting materials by tracking the resistance-temperature relationship and understanding the transitions between normal and superconducting states. It has features: 

1. The system measures the resistance-temperature relationship using a four-lead method at various current levels, allowing accurate determination of the critical temperature of superconducting materials.

2. The apparatus can handle a wide current range, making it suitable for measuring the temperature and resistance variations during heating and cooling cycles at different currents. This flexibility allows analysis of dynamic temperature differences and their influence on superconductivity.

3. The experiment uses BSCCO wire material, which is stable at room temperature and does not undergo hydrolysis, ensuring long-lasting durability and easy storage for repeated experiments.

4. The system uses liquid nitrogen (LN₂) for achieving low temperatures, and includes a Dewar to hold the LN₂ and maintain the desired cryogenic environment. This feature is essential for reaching the low temperatures required for measuring superconducting properties.

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. Students will gain hands-on experience working with cryogenic temperatures and the use of liquid nitrogen in scientific experiments.

2. The apparatus allows students to measure the critical temperature of BSCCO superconducting wire and analyze its resistance-temperature characteristics. Understanding this relationship is key to identifying the transition from the normal state to the superconducting state.

3. The experiment teaches the basic properties of superconductors, including how to determine the superconducting state and understand the transition at the critical temperature.

4. Students will learn how to measure and analyze the resistance-temperature relationship, a key technique for identifying and understanding superconducting transitions.

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.

Specifications

Part List