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Superconductor01:24

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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...
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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
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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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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.