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Superconductivity and Ferromagnetism in Sr2RuO4

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Questions and Answers

What is the crystal structure of Sr2RuO4 compared to La2CuO4?

The crystal structure of Sr2RuO4 is almost identical to La2CuO4. (correct)
The crystal structure of Sr2RuO4 is similar but not identical to La2CuO4.
The crystal structure of Sr2RuO4 is completely different from La2CuO4.
The crystal structure of Sr2RuO4 is completely unknown.

What is the magnetic property of Sr2RuO4 compared to La2CuO4?

Sr2RuO4 is ferromagnetic, while La2CuO4 is antiferromagnetic. (correct)
Sr2RuO4 is antiferromagnetic, while La2CuO4 is ferromagnetic.
Both Sr2RuO4 and La2CuO4 are antiferromagnetic.
Both Sr2RuO4 and La2CuO4 are ferromagnetic.

What is the electronic configuration of the Ru(IV) in Sr2RuO4?

The Ru(IV) has a 4d^3 electronic configuration.
The electronic configuration of Ru(IV) in Sr2RuO4 is unknown.
The Ru(IV) has a 4d^5 electronic configuration.
The Ru(IV) has a 4d^4 electronic configuration. (correct)

How are the Cooper pairs formed in the ferromagnetic superconductors like Sr2RuO4?

The Cooper pairs are formed by magnetic interactions, with their spins aligned giving a triplet state. (C) Signup and view all the answers

What is the order parameter of the Cooper pairs in the ferromagnetic superconductors?

The order parameter is odd, since the Cooper pairs have the same spin. (B) Signup and view all the answers

How do the latest NMR spectrometers improve sensitivity?

The latest NMR spectrometers employ superconducting magnets to provide large magnetic fields, improving sensitivity. (A) Signup and view all the answers

What is the main advantage of low temperature superconducting magnets over conventional electromagnets?

They can carry higher currents and eliminate the need for an iron core (A) Signup and view all the answers

What is a key feature of Superconducting Quantum Interference Devices (SQUIDs)?

They can measure voltages as small as 10–18 volt (B) Signup and view all the answers

Why are Josephson junctions used in Superconducting Quantum Interference Devices (SQUIDs)?

To improve sensitivity to magnetic fields (D) Signup and view all the answers

What is a significant application of SQUIDs in geology?

Prospecting for minerals and oil based on local changes in magnetic field (B) Signup and view all the answers

How do maglev trains achieve levitation above the track?

By repelling superconductors on the train with coils of wire on the track (B) Signup and view all the answers

Why are high-temperature superconductors considered promising for applications like electricity distribution?

Because they can carry direct current with no loss of power (B) Signup and view all the answers

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