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Spin-liquid behavior in electronic griffiths phases.

D Tanasković1, V Dobrosavljević, E Miranda

  • 1Department of Physics, Florida State University, Tallahassee, 32306, USA.

Physical Review Letters
|October 26, 2005
PubMed
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We found that strong disorder generates sub-Ohmic dissipation, suppressing Kondo screening on some spins and leading to universal spin-liquid behavior in electronic Griffiths phases.

Area of Science:

  • Condensed Matter Physics
  • Quantum Many-Body Systems

Background:

  • The Kondo effect describes the interaction between localized magnetic moments and conduction electrons.
  • RKKY interactions mediate magnetic coupling between localized moments via conduction electrons.
  • Electronic Griffiths phases are quantum critical regions characterized by diverging susceptibility.

Purpose of the Study:

  • To investigate the interplay between the Kondo effect and RKKY interactions in electronic Griffiths phases.
  • To understand the role of disorder in these quantum critical phenomena.

Main Methods:

  • Utilizing extended dynamical mean-field theory (eDMFT) methods.
  • Analyzing the behavior of spins and electronic interactions under varying disorder strengths.

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Main Results:

  • Sub-Ohmic dissipation emerges for sufficiently strong disorder.
  • Kondo screening is suppressed on a finite fraction of spins.
  • Universal spin-liquid behavior is observed.

Conclusions:

  • Disorder-induced sub-Ohmic dissipation fundamentally alters the nature of magnetic interactions in these systems.
  • The findings reveal a novel pathway to realizing spin-liquid states in disordered electronic systems.