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Superconductor

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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 from Emerging Magnetic Moments.

Shintaro Hoshino1,2, Philipp Werner2

  • 1Department of Basic Science, The University of Tokyo, Meguro, Tokyo 153-8902, Japan.

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This summary is machine-generated.

Multiorbital Hubbard models reveal a spin-triplet superconducting phase stabilized by local moments. This fluctuating-moment-induced superconductivity may occur in materials like strontium ruthenates.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Multiorbital Hubbard models are crucial for understanding complex electronic correlations.
  • Spin-triplet superconductivity involves electron pairs with parallel spins, distinct from conventional spin-singlet pairing.
  • The emergence of local moments in metallic phases can significantly alter electronic properties.

Purpose of the Study:

  • To investigate the occurrence and characteristics of spin-triplet superconductivity in multiorbital Hubbard models.
  • To identify the conditions and mechanisms stabilizing this exotic superconducting phase.
  • To explore the relationship between local moment formation and superconductivity.

Main Methods:

  • Theoretical modeling using multiorbital Hubbard Hamiltonians.
  • Analysis of the model's phase diagram, including superconducting, metallic, and magnetic regions.
  • Investigation of electron pairing mechanisms, focusing on spin anisotropy and local moment dynamics.

Main Results:

  • A spatially isotropic spin-triplet superconducting phase was identified.
  • This phase is stabilized in a spin-freezing crossover regime characterized by emergent local moments.
  • Superconductivity is enhanced by spin anisotropy and occurs adjacent to non-Fermi-liquid metallic and magnetically ordered phases.

Conclusions:

  • Fluctuating-moment-induced superconductivity, distinct from quantum critical fluctuations, is demonstrated.
  • The findings suggest potential realization in real materials like strontium ruthenates and uranium compounds.
  • This work provides theoretical insights into novel mechanisms for exotic superconductivity.