AQA · A level Physics

Graphene superconductivity A-level Physics challenge

Can you get 100%? Use layered graphene in a strong magnetic field to test zero resistivity, electrical power loss and scientific evidence.

Read about superconductivity in layered graphene

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Question

8 marks

Answer all parts. Show your working and give units where appropriate.

1(a)

State what is meant by superconductivity and the critical temperature of a superconductor.

[2 marks]

1(b)

A graphene device carries current . In its normal state its resistance is . Calculate the electrical power transferred to thermal energy in the normal state and state the corresponding value in an ideal superconducting state.

[3 marks]

1(c)

In many superconductors a strong magnetic field breaks the electron-pairing state. In this experiment a zero-resistance state survived up to and became stronger over part of the field range. Explain why this result challenges a conventional pairing model but does not by itself prove a particular alternative mechanism.

[3 marks]

Start the question to write your answer, receive marks and ask Sherlock Ohms for text help.