Related Experiment Video
Updated: Dec 14, 2025
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
10.1K
Multiband superconductors with degenerate excitation gaps
Paulo J F Cavalcanti1, Tiago T Saraiva2, J Albino Aguiar1
1Departamento de Física, Universidade Federal de Pernambuco, Av. Prof. Aníbal Fernandes, s/n, 50740-560, Recife-PE, Brazil.
Summary
Multiband superconductors are not always multigap superconductors. This study shows that the number of bands, not just gaps, impacts magnetic properties, affecting the transition between superconductivity types I and II.
Area of Science:
- Condensed Matter Physics
- Superconductivity Research
Background:
- A common assumption equates multiband superconductors with multigap superconductors.
- The number of superconducting energy gaps is often presumed to dictate the number of contributing bands.
Purpose of the Study:
- To investigate the magnetic properties of multiband superconductors.
- To challenge the assumption that the number of spectral gaps defines the number of contributing bands.
Main Methods:
- Theoretical analysis of superconducting magnetic properties.
- Examination of the influence of characteristic condensate lengths.
Main Results:
- Superconducting magnetic properties are sensitive to the number of contributing bands, even with degenerate spectral gaps.
- The crossover between superconductivity types I and II is significantly influenced by differing characteristic lengths of multiple condensates.
- Coexisting condensates with diverse lengths exhibit constructive or destructive interference, leading to multi-condensate magnetic phenomena.
Conclusions:
- The number of contributing bands in multiband superconductors plays a crucial role in their magnetic behavior, independent of the spectral gap structure.
- Understanding the interplay of multiple condensates is key to comprehending the magnetic phenomena in these materials.
Related Concept Videos
01:28Types Of Superconductors
1.5K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.5K
01:24Superconductor
1.6K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
1.6K
02:35Band Theory
16.8K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
16.8K
01:22Semiconductors
1.2K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.2K
01:27Biasing of Metal-Semiconductor Junctions
466
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
466
01:18Magnetic Field Due to Two Straight Wires
4.1K
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
4.1K