Type I and Type II Superconductors - Superconductors & Supercapacitors - Engineering Physics 1

TL;DR

Superconductors can be classified into type 1 and type 2 based on their behavior in an external magnetic field. Type 1 superconductors have a sharp transition from superconducting to normal state at a critical field value, while type 2 superconductors exhibit a mixed state between the two.

Transcript

hello friends in today's class we are going to extend our study on superconductors and will study the classification about type 1 and type 2 superconductors so type 1 and type 2 semiconductors are the classification which is based on the behavior in external magnetic field so superconductors are divided into two categories depending on the way in w... Read More

Key Insights

• 🅰️ Superconductors can be classified into type 1 and type 2 based on their behavior in external magnetic fields.
• 🅰️ Type 1 superconductors have a sharp transition from superconducting to normal state at a critical field value, while type 2 superconductors have a mixed state between the two.
• 💯 Type 1 superconductors are characterized by complete Meissner effect and perfect diamagnetic behavior.
• 🅰️ Type 2 superconductors do not exhibit complete Meissner effect and may show partial diamagnetic behavior.
• 🏑 Type 1 superconductors have only one critical magnetic field, while type 2 superconductors have two critical magnetic fields.
• 🅰️ The upper critical field for type 2 superconductors is much higher compared to type 1 superconductors.
• 🅰️ Type 1 superconductors are naturally occurring elements, while type 2 superconductors are often synthesized alloys.
• 🅰️ The transition from superconducting to normal state is reversible for both type 1 and type 2 superconductors.

Questions & Answers

Q: What is the main difference between type 1 and type 2 superconductors?

The main difference is in their response to magnetic fields. Type 1 superconductors have a sharp transition from superconducting to normal state, while type 2 superconductors exhibit a mixed state between the two.

Q: What is the significance of the critical field value (hc) for superconductors?

The critical field value determines the point at which a superconductor transitions from being in a superconducting state to a normal state. It is an important parameter for classifying superconductors.

Q: Why are type 1 superconductors also called soft superconductors?

Type 1 superconductors are called soft superconductors because their critical field values are low, typically around 0.1 Tesla. They have a limited range of application due to their low critical fields.

Q: What is the mixed state or vortex state in type 2 superconductors?

The mixed state or vortex state is an intermediate state between superconducting and normal states in type 2 superconductors. In this state, the material exhibits both superconducting and normal properties.

Q: What happens when the critical field value (hc) is exceeded for type 1 and type 2 superconductors?

For type 1 superconductors, exceeding the critical field value leads to a sharp loss of magnetization and the material behaves like a normal conductor. In type 2 superconductors, exceeding the critical field value leads to a gradual reduction in magnetization and eventually a complete loss of superconductivity.

Summary & Key Takeaways

• Superconductors can be divided into two categories, type 1 and type 2, based on their response to external magnetic fields.

• Type 1 superconductors have a sharp transition from superconducting to normal state at a critical field value.

• Type 2 superconductors exhibit a mixed state between superconducting and normal states.