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Superconductor01:24

Superconductor

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...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Types Of Superconductors01:28

Types Of Superconductors

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...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Related Experiment Video

Updated: May 8, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Superconductivity with Rashba spin-orbit coupling and magnetic field.

Florian Loder1, Arno P Kampf, Thilo Kopp

  • 1Center for Electronic Correlations and Magnetism, Experimental Physics VI, Institute of Physics, University of Augsburg, Augsburg, Germany. florian.loder@physik.uni-augsburg.de

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 13, 2013
PubMed
Summary

This study explores superconductivity in oxide interfaces, revealing how spin-orbit coupling and magnetism create asymmetric Fermi surfaces. These conditions favor specific pairing mechanisms, leading to distinct superconducting states with tunable properties.

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Last Updated: May 8, 2026

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06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

Published on: April 12, 2019

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Two-dimensional electron systems (2DES) at oxide interfaces exhibit tunable Rashba spin-orbit coupling.
  • Proximity-induced ferromagnetism generates strong local magnetic fields at these interfaces.
  • The interplay of these phenomena is crucial for understanding exotic electronic states.

Purpose of the Study:

  • Investigate the impact of coupled spin-orbit coupling and magnetism on superconductivity in 2DES.
  • Determine the favored superconducting pairing mechanisms (intra- or inter-band).
  • Map the phase diagram of superconducting groundstates under these conditions.

Main Methods:

  • Microscopic pairing model to derive superconducting order parameters.
  • Analysis of asymmetric two-sheeted Fermi surfaces.
  • Calculation of density of states, spectra, and momentum distribution functions.

Main Results:

  • Identification of Bardeen-Cooper-Schrieffer (BCS) superconductor with inter-band pairing.
  • Discovery of a mixed parity state with finite-momentum intra-band pairing.
  • Detailed phase diagram illustrating different superconducting groundstates.

Conclusions:

  • The combination of Rashba spin-orbit coupling and ferromagnetism dictates the nature of superconductivity at oxide interfaces.
  • Tunable superconducting states, including BCS and mixed parity, are realized.
  • Findings are relevant to LaAlO3-SrTiO3 interfaces and superconductors with broken inversion symmetry.